excl. VAT inc. VAT

MDPE (Medium Density Polyethylene) pipes are commonly used in the drainage industry due to their durability, strength, and flexibility. These pipes come in a range of colours, each of which serves a specific purpose. In this blog, we will explore the different colours of MDPE pipes used in the drainage industry and their applications.

Blue MDPE Pipe:

Blue MDPE pipes are commonly used for carrying potable water. The blue colour indicates that the pipe is suitable for carrying water that is safe for human consumption. These pipes are often used in water treatment plants, water distribution networks and in domestic plumbing applications.

Black MDPE Pipe:

Black MDPE pipes are used for non-potable water applications, such as irrigation and industrial water supply. The black colour of the pipe helps to prevent the growth of algae and other microorganisms, making it a suitable choice for use in outdoor environments.

Yellow MDPE Pipe:

Yellow MDPE pipes are used for gas distribution. The yellow colour indicates that the pipe is suitable for carrying natural gas or LPG (liquefied petroleum gas). These pipes are often used in gas distribution networks, industrial applications and in domestic gas supply systems. In conclusion, MDPE pipes are available in a range of colours, each of which serves a specific purpose in the drainage industry. By understanding the different colours and their applications, it is possible to select the right pipe for a particular application, ensuring that it is safe, efficient, and effective

Different types of drainage systems

There are two category types of drainage categories, one being foul water and one being surface water. Any contaminated water from your bathroom, kitchen, or utility room is considered foul water and is always directed to a foul water drain. However, surface water drainage

Most properties either have older drainage systems or combined drainage systems, that directs precipitation to the dirty drain through a series of gully traps to keep bad odors from escaping the drain.

However, the two drainage systems are kept apart in modern homes and systems, and rainfall is either drained into a soakaway, a watercourse, or a surface water sewer. A soakaway is typically nothing more than a hole in the ground that has been backfilled with coarse stone, allowing surface water to percolate back into the ground.

Installing your drainage system

You should always make sure that you communicate with the Building Control Department at your local Council, regardless of whether you are installing a new drainage system or intend to make changes to an existing drainage network. You must provide blueprints that specify the range of the work to be done, making sure that the work complies with the most recent Building Regulations because, in essence, the job will need to be passed off and inspected thereafter. On the other hand, if you are simply replacing broken pieces, notification is not required.

Underground drainage

All drainage pipes and underground drainage fittings should be Terracotta in colour to ensure compliance with the Building Regulations and prevent the works from having to be rejected by the Building Control Department.

How to install your underground drainage systems?

A network of flexible plastic pipes, inspection chambers, rodding points to clear any clogs, and access fittings make up modern underground drainage systems.

It is crucial that there be appropriate cover of at least 600mm because such materials are prone to distortion under load. The material used as the cover’s backfill should permit percolation; often, pea shingle or another granular form of stone is utilised.

Trenches can be built by hand although a small excavator or micro digger is usually preferred. Building regulations should be followed, and anything deeper than 1,200 mm must always be supported or shored up. The sides should ideally be dug at an angle of repose to reduce the risk of the excavated material collapsing in on itself and causing significant damage or death.

Use a hacksaw and mitre block to precisely measure the drainage pipes’ dimensions and cut them to fit. The freshly cut pipe will have rough edges after being cut, therefore the surplus burrs need to be removed and the edges need to be chamfered at a 45-degree angle with a wood file. Using a cloth to wipe the pipe should be sufficient.

It is simple to connect underground drainage pipes and the fittings that accompany them, but the male and female ends of each component must be lubricated to fit together. They ought should slot together rather easily after being greased.

Surface Water Drainage

Channel drains are a typical building material that are employed globally for several applications. They may also be referred to as linear drains or trench drains. But how do drainage channels work?

Unlike gullies, which only drain water from one point along their length, linear drainage systems do so continuously. They consist of a closed channel with a grating of some kind on top.

A channel drain’ fundamental function is to remove surface water from a specific area. They should never be placed uphill, but rather at a location where surface water is likely to roll towards.

To Find out more about Channel Drainage, visit our sister website www.polychannel.co.uk or alternatively if you want to read more on the installation process of channel drainage check out our blog post ‘How to install Channel Drain’

To shop our underground drainage products, why not click here. Or for any more information surrounding our underground drainage pipes drop us an email at sales@polydrianage.co.uk

Maintenance on your manhole cover is extremely important, even there is a small issue with your manhole now is the time to fix it, by replacing it. Even a small crack in the middle of the manhole can be extremely dangerous, especially in areas where there are pedestrians and small children stepping over it, as it has an increased risk of falling through. Either way, no matter the damage, a replacement manhole cover is required.

Replace your manhole cover using the steps below…

Firstly, you need to take an accurate measurement of the manhole cover you currently have installed. To do so, you need to get a clear measurement, this is the width, height and depth of the hole in the ground. To get yourself a clear measurement of the opening, take your tape measure and measure the inside of the inspection chamber from wall to wall. It is suggested that every manhole is measures this way and this will allow you to find the exact replacement.

Measuring replacement manhole cover

If your manhole cover does have an inspection chamber underneath then it is imperative that you measure the diameter of the circular chamber, so that you can ensure your manhole cover matches. We would also suggest that when purchasing the replacement manhole, you check to see whether the cover and frame selected is compatible with all the main inspection chambers brands.

Secondly, you need to pick your load class. Every manhole is designed to sit within a specific load class, which allows you to understand the maximum weight the manhole can safely take. E.g., if a manhole cover is to be installed in a shopping center car park, then you can safely say that you would need a manhole cover that can withstand a C250 loading.  This to ensure that the manhole continues to perform correctly when cars are moving over it.

Below shows a break down of the different load classes suitable for manholes.

Choosing your materials, here at PolyDrainage we specialise in Ductile Iron and Composite. Choosing the material is totally up to you, However, below shows the benefits of each material.

Ductile Iron Benefits:

Composite Benefits:

For any more information surrounding changing and maintaining your manhole cover, please do not hesitate to get in touch with us at sales@polydrainage.co.uk

Inspection chambers are points of entry to underground piping that enable maintenance and obstruction clearance. There is a very high likelihood that you will need to create an inspection chamber when installing any kind of subterranean drainage. Manholes and inspection chambers serve similar purposes, with the exception that manholes permit physical entry while inspection chambers are exclusively used for cameras and equipment.

Where should you install it?

Every time a branch pipe connects to a main drainage run, inspection chambers ought to be put in. This will make it simple to access ongoing drainage channels without using a lot of drain rods. Additionally, it minimises the distance that any inspection cameras must cover. Install another inspection chamber there whenever a drainpipe changes direction by more than 30 degrees or when a straight drainpipe run is longer than 20 meters.

Installing sufficient inspection chambers throughout the drainage system will ensure that every component is reachable with a drain rod, according to the general rule of thumb.

 What are inspection chambers made from?

Some manufacturers of inspection chambers provide the components as a whole system, while other manufacturers demand that you purchase each component separately. Inspection chambers are made up of three parts: a base, a riser, and a lid. Rubber seals between components hold the inspection chamber’s components together.

The cover…

An inspection chamber’s cover is often made of plastic, protecting it from tampering and unauthorised entry. For safety reasons, it also conceals the hole in the ground. To comply with standards for installation in driveways, parking lots, and other heavily used areas, covers for inspection chambers are available in a variety of weight load classes and come in both round and square shapes.

The Riser…

The middle part of the system, which comes in a variety of heights, is called a riser in an inspection chamber. The inspection chamber cover rests comfortably at the surface thanks to the riser’s addition of just the correct amount of height, which is attached to the base by rubber seals. These have corrugated exteriors that can be cut with a saw to facilitate this process.

The Base…

Naturally, the element at the “bottom” that is closest to the drainpipes is an inspection chamber base. A base can accommodate pipes with a diameter of 110mm or 160mm thanks to a variety of inlets. There are various bases with various inlet counts available for purchase. Use a blanking plug if you have more inlets than pipes.

The installation…

The middle part of the system, which comes in a variety of heights, is called a riser in an inspection chamber. The inspection chamber cover rests comfortably at the surface thanks to the riser’s addition of just the correct amount of height, which is attached to the base by rubber seals. These have corrugated exteriors that can be cut with a saw to facilitate this process.

To view our range of inspection covers, chamber risers and chamber bases, click here.

For specialised purposes, non-standard sizes inspection chambers. Or even some more information surrounding inspection chambers. Get in touch with us at sales@polydrainage.co.uk

Introducing our new Jumbo Grease traps supplied to us by Turtle Enviro. Designed to enhance and improve the performance against fats, oils, and greases.

A grease trap is most commonly used in commercial kitchens and smaller scale restaurants to ensure that they can meet the requirement of all relevant legislations. The Jumbo grease trap has been designed to meet both building regulations Part H and BS EN 1825 the British standard for all grease traps and separators.

The Jumbo grease trap is an underground, fat, oil, and grease interceptor created to operate passively. Simply stopping the flow of wastewater and allowing it to cool and separate into three layers inside the interceptor—FOGs, solids, and water—is how passive designs function.

FOGs (Fats, Oils, and Greases) float to the top of the water because they have a specific gravity that is lower than that of water, which causes them to separate from the water as wastewater enters the unit. All passive grease traps/interceptors operate on the principle of “Gravity Separation,” which is a tested design.

Solids and food waste, which are heavier, will fall to the unit’s base as the FOGs build a “grease layer” at the top. By using the hollow baffle and step to define a flow path inside the unit and, in addition, the moulded step, which enables better settlement and enhanced storage of solids and sludge, the Jumbo’s patented design improves this separation process.

Our Jumbo grease trap is now 22% deeper than the previous model, increasing the working volume to 340 litres, converting the unit to a Nominal size 1 and providing 20% additional solids storage due to an increased step height.

For any more information on our new Grease Traps, supplied by Turtle Envrio please visitour website at www.polydrainage.co.uk.

Underground drainage pipes play a crucial role in keeping our homes and surrounding areas safe from flooding and water damage. Connecting these pipes properly is essential to ensure efficient water flow and prevent any potential blockages. In this blog, we will discuss how to connect underground drainage pipes and the equipment required to do so.

Step 1: Determine the Pipe Size and Direction

Before you start connecting underground drainage pipes, you need to determine the pipe size and direction. The size of the pipe will determine the type of connector or coupler you will need to use. The direction of the flow will determine the slope of the pipes and where the connection should be made.

Step 2: Cut the Pipes to Size

Using a saw or pipe cutter, cut the pipes to the required size. Ensure that the cuts are straight and clean to prevent any leaks or blockages.

Step 3: Clean the Pipes

Before connecting the pipes, make sure that they are clean and free from any debris or dirt. This will ensure that there are no obstructions in the flow of water.

Step 4: Attach the Couplers

Using the appropriate couplers or connectors, to attach the pipes together. Make sure that the couplers fit snugly and are securely attached. Depending on the type of coupler, you may need to use a rubber seal or adhesive to prevent leaks.

Step 5: Use a Level to Check the Slope

To ensure proper water flow, it is important to check the slope of the pipes. Use a level to make sure that the pipes have a gradual slope and are not level or sloping in the wrong direction.

Step 6: Cover the Pipes

Once the pipes are connected and the slope is checked, cover the pipes with soil or gravel. This will protect the pipes from any damage and help to blend them into the surrounding area.

Equipment Required:

In conclusion, connecting underground drainage pipes is an important task that requires proper planning and equipment. By following the steps outlined above, you can ensure that your pipes are connected properly and efficiently. It is also important to regularly check and maintain your drainage system to prevent any blockages or damage.

For any more information on our new Grease Traps, supplied by Turtle Envrio please visitour website at www.polydrainage.co.uk.

Ducting coil is used to guarantee that pipes and cables are shielded against external forces, which may interfere with how the cables should operate. 

Ductwork indicates to an installer that there are significant subsurface drainage pipes or services present, suggesting that it will be left alone or simple to repair if necessary. So, it is crucial that the installation is completed to a high degree because it simplifies subsequent tasks and guarantees that whatever is travelling through the duct itself may function as intended.

Top Tip**

The most crucial thing is to make sure ducting is done correctly. We are here to help and give you everything you need to know regarding ducting coil, including legal requirements surrounding the procedure, the installation process, as well as all the do & don’ts for ducting coils. 

What colour should you use?

Before you start any job, which included ducting it is extremely vital that you get the fundaments correct before you begin. The equipment needed for your project will be determined by the cables/ wires passing through and what they are used for. This is due to the fact that it is that it is legal requirement in the UK.

Ground workers can adopt the appropriate approach when there is construction going on around them since the colour of the pipes help them identify what is passing through the ducting.

Below highlights the correct colours used during ducting installation:

Orange – Used for street lighting/ traffic light signals.

Green – Used for the protection or any CCTV cables or fibre optic materials.

Blue – Used for water mains.

Black – Used to protect electricals.

Yellow – Used for gas.

Ducting Coils Colours Explained

How to decide which material is the right one for your project.

When deciding which material is best for you, we always advise speaking with a utility specialist. Nonetheless, there are a few broad guidelines you can adhere to that are generally accept.

The black electrical cable duct pipe x 6m is an excellent choice for short-distance duct installation because it is composed of high-density polyethylene. These six-meter lengths can be the best option for you because they are simpler to handle across short distances than the coils, which might make life more challenging because they are 25- or 50-meter coils. The most common length for cables is six metres.

The flexible coils (25m/50m) are useful for installations across extended distances. Flexible coils are frequently needed for installing electric cable to buildings. Moreover, they are available in Twinwall HDPE coils (high density polyethylene). This basically means that the ducting can handle abrupt changes in angles because of its improved flexibility while completing specific ducting installations in non-standard locations. The structure and strength of the ducting are improved by using polyethylene for both the smooth inner wall and the ridged outer wall, which maintains the ability of ordinary pipes to be dragged through by wires and pipes. Therefore, avoid the typical error of purchasing bends that are too rigid for the pipe and the terrain you are traversing will increase project duration.

When do you need to use extra strength ducting?

We recommend trying a stronger ducting pipe when the duct will be supporting a utility pipe in an area that needs to sustain significant loads. For instance, you would choose a higher resistance form of ducting if you had to run a specific type of MDPE pipe underneath a road. The enhanced strength types of ducting are only created to meet the required load rating; no specific material is employed in their construction.

When selecting the proper ducting to house your electrical wires, there is a little more to consider since it must be excellent enough to match the legal quality standards in existence. It is crucial that the ducting complies with BS EN 61386 and the 12–24 classes established by Energy Network Association Technical Specification if the electric cables are being run underground (ENATS).

The key information that you should be aware of prior to installing your electrical ducting is covered in both blog posts.  There are three main class types of ducting that you should be aware of, and this is one of the most crucial lessons that can be learned from both. Class 3 ducting is the most often used because it is made for everyday use, while class 1 ducting is used for high voltage cables and class 2 for low voltage purposes.

Don’t give in to the temptation to choose ducting if you are ever unclear about what is required. This will only produce negative outcomes. You can get in touch with us, and we’ll try to assist you. To lessen the chance of causing a hazard or breaking the law, we strongly advise that you consult a specialist.

Following the ducting guidelines.

To ensure you follow the guidelines correctly it is crucial that you seek the assistance needed if you are struggling to understand anything. Whenever, you are unsure or lack the ability to install specific types of ducting, you can use other government-written materials are available. As well as this we can ensure that you will be able to find other multiple online resources. By doing the correct research will ensure that you are completing the project correctly, as well as abiding by the rules and legalisations surrounding ducting.

Where will your ducting be positioned?

Know you fully understand the importance of ducting colour codes, you need to know where it will be going. The ground you are excavating almost always has old ducting with cables or pipes running through it, so you will need to examine it before you dig. Before you start installing anything, you can easily verify this by looking at the project blueprints and with an onsite expert. From here, you can securely determine where not to dig and make an informed decision about where your ducting will rest.

According to government standards, it is ideal to install the ducting so that it matches the layout of the existing roadways and paths. By reducing the number of black electrical ducting bends required as much as feasible, you can lower the project’s overall cost. It is advised that you offer a general notion of where you want your ducting to go by laying it out on the ground before making a final decision.

Laying lengthy radius bends for the straight duct and access chambers for the variations in angles is a wise measure to take to guarantee that you are aware of the parts you will undoubtedly need for your ducting installation. This creates an individual model that you can physically inspect and look at, enabling you to completely evaluate whether your plans are true. Make sure to account for the space needed for the necessary bends if you are installing your ducts using a flexible coil.

This is a fantastic approach to begin to visualise the project. So, it’s crucial that you utilise the appropriate ducting for the job. So, you would normally choose one of the flexible ducting pipe coils if you needed ducting with a little more give.

Our coils are the best option for underground use because they are light but durable and have an integrated draw cord. They also come in big coils to aid with lengthy distances. While utilising solid twin wall duct, keep in mind that it comes in six-meter lengths, is designed to be hard, and has less flexibility than the coils that are most frequently used. They are primarily utilised to decrease the amount of bends in a system and have less airflow resistance than flexible coils, which results in a higher capacity. Ducting is unique in that it is designed to be utilised in circumstances when a little bit extra sturdiness and dependability are needed. To ensure that the flow is not impeded in any way, the interior of the ducting is still smooth.

Before proceeding with the process, make sure you clearly understand the kind of ducting you require and how it will be applied. Don’t forget to mark off this area.

How to keep safe during your project

When beginning any project that calls for the use of resources like gas, electricity, or water, you must be certain that you are approaching it safely. Taking a closer look at this, you must turn off all utilities, including the supply to them, before you begin working. This is due to the possibility that, in the worst-case situation, you may cause fatal injury by working or encountering something that was live. Dealing with Ducting especially in the installation process should be done with vast caution. 

First things first, you must dig your trench. Don’t forget there will most likely already be ducting buried in the ground. Therefore, it is vital that you keep a close eye on specific things when undertaking your project.

One thing you should always be wary about when digging in areas where there may be old pipes, is that they may not have warning tape or indicators identifying the type of material it is constructed out of or what it was used for. We would advise to proceed with caution when faced with issues like this as the pipes will be old and the regulations that where in effect at the time of installation will now be out dated. We would also recommend you to be aware that the colour may not be the most accurate indication of what the pipe is or was used for because older pipes may also be discoloured because of the extended periods they have been buried for.

Again, if you are unsure of anything when digging a new trench and being face with older pipe work and discoloured ducting, we recommend that to seek advice from a professional.

However, on the other hand if everything goes smoothly and you stick to the path you had planned for your pipe, you should have a lovely trench for your ducting to fit into. To create a protective bend for the ducting to sit in, it is occasionally required to add a layer of grit sand at the bottom of the trench that is about 45 to 50 mm thick. It’s time to install the ducting after the trench has been established!

Getting started with the installation process…

The last thing you want to happen when installing the ducting is to lay the coil only to discover that it is damaged, so we advise performing a fast inspection of the coil before moving forward with the procedure. If everything checks out, you should be ready to start your project.

The next phase is simply to begin inserting your ducting into the trenches you have made. The last thing you want is to lay your lengths or coils of black Twinwall duct and then discover that you don’t have the proper twin wall or seals. So be sure you are using the right couplers and seals.

In addition, using a draw cord with your twin wall is crucial if you want to make threading cables through the ducting as simple as possible. To spare you the time and inconvenience of having to do it yourself, many of our coils already have the threaded cord inside of them. If this isn’t the case, though, make sure you have some anyhow to give yourself the peace of mind that everything will be ready when the wires need to be threaded through the ducting.

We advise getting a piece of fabric that fits the width of your pipe without hindering its ability to be pulled through, then attaching the draw cord. This will help you get the cord through the ducting. You can even use a hoover with tape to attach top the other end of the pipe,  and after using the using the hoover for a little while the draw cord should extend there. After that you would be required to hook your wires to the draw cord that has already been threaded through the ducting and use the other end to assist in pulling the cord through the ducting. You are one step closer to finishing the project now that cables are running through your ducting.

Finally, once everything is in place, all ducting installations should be double-checked. While running electrical products via the ducting, such as cables, the seals and points of connection are always the most important things to verify. This is since moisture will alter electrical components if it enters the system, which could turn into a safety problem. However, if everything is in order and you are satisfied with the ducting in general and the sealing points, it is now time to apply the tape and lay the backfill.

Backfilling in detail

When you backfill, you are reusing or replacing what has been dug up. Covering the actual ductwork with 150mm of sand is standard practise in the sector. Because the sand will act as a barrier, this can prevent the duct from being harmed by any piercing instruments. From here, you can add more soil, or another backfill of your choice to replace the remaining space.

You must first make a warning of what is underneath before you can finish off anything, and that is where the warning tape comes in. Because there are so many various types of ducting and tape, it is important to make certain that the type of warning tape you choose corresponds to the type of ducting you are using. Before backfilling the remaining space, the tape must run the complete length of the duct.

To view our range of warning tape here – ‘Click here’

Once you have marked your ducting correctly and completed the backfill your project is complete. If you have any further questions about any of our products, don’t hesitate to contact us!

The application determines manhole cover sizes and load classifications. You must measure the area to ensure a precise fit whether you’re installing a new manhole cover or replacing an old one. Regardless of the load class, if your manhole cover doesn’t fit precisely, you risk compromising the structural integrity and it could fail.

How do you measure manhole cover sizes?

The internal dimensions of the hole, not the manhole cover itself, must be measured in order for the cover to fit snugly over the hole it is concealing. Since millimetres are the manufacturers’ standard measurement unit, it must be done in millimetres for precision. Once you have this measurement, you should explore our selection of manhole covers, just use table below to determine which product is appropriate for your job, or call our helpdesk at 0161 235 1214 to get assistance.

Manhole Cover Sizes

Manhole coverings are available in square and rectangular sizes ranging from 300 x 300 mm to 1200 x 1200 mm. We also offer circular manhole covers with 450mm and 600mm dimensions.

Ductile iron manhole cover weight classes.

The same weight class system that applies to channel drains also applies to ductile iron manhole covers.

ClassMax. weight load (tonnes)Users
A151.5For pedestrian areas including gardens, patios, and driveways, very light duty.
B12512.5Domestic driveway thresholds for family cars, vans and 4x4s
C25025Roads with little traffic and small private parking areas.
D40040Highways, main roads, and heavily travelled sites such public parking lots.
E60060Loading bays, industrial parks, and freight handling yards.
F90090Extremely heavy-duty applications including docks and airports.

Types of manhole covers

Other than manhole covers sizes and load classes, there are a few types of manhole covers to choose from.

Ductile Iron

Over a D400 class, ductile iron manhole covers are sturdy, resilient, heavy-duty covers that are frequently utilised. Cast iron, commonly known as ductile iron, is utilised because of its high strength. This material then lends itself to installation at docks, airports, and other high-use industrial sectors with a lengthy lifespan.

Ductile Iron Manhole cover


Recessed manhole covers are covers with a cut out in the tray that allows for the installation of brick pavement, cement, and screed. In pedestrianised areas where aesthetics are important, this makes it possible for the recessed manhole cover to fit in with its surroundings. In hospitals, workshops, and domestic gardens where homeowners don’t want an unsightly but required manhole cover jutting out, it’s also a viable alternative for internal manhole covers.

Recessed Manhole Cover

Solid top

Manhole covers with a solid top are intended to stand out in the floor. These are generally put in places where having a manhole cover visible would be better for safety and routine maintenance than having one hidden. A visible silver manhole cover with an anti-slip surface is a common example of a solid top. In some cases, depending on where they are situated, they might also be raised. They are simple to distinguish because of the contrast between the solid top manhole covers and the solid floors.

Solid Top Manhole Cover

Ducting coils We provide a wide variety of cable and pipe ducting at PolyDrainage, so whether you need ducting pipe lengths, tracer wire, or even ducting access boxes, we can help. Our helpful crew is always accessible to answer any queries, and we have items that are suitable for electrical, gas, water, fibre optic, and even traffic and street light ducting.

Our ducting coils are stocked in 63mm & 110mm diameters. 

Below is a breakdown of the ducting coils available at PolyDrainage, and what they can be used for. 

Orange Ducting

Used to protect cables streetlights and traffic signals. 

Blue Ducting

Used to protect Water service pipes. 

Green Ducting

Used to protect any cables/ wires linked to CCTV. 

Yellow Ducting

Used to protect and cover any gas lines. 

Black Ducting

Used to protect and cover any cables linked to electricity.

To shop our range of ducting coils and accessories, click here.

If you would like to receive any extra information surrounding our ducting coils, you can contact us on or alternatively send us an email at sales@polydrainage.co.uk

Drainage gullies by definition is a drainage fitting with an open top, a definite base and outlet with one or more sides. Gullies can be used to connect wastewater outlets or stormwater/rainwater outlets to suitable drains, depending on the type. Drainage gullies can also be used to prevent drain blockages, as they let the wastewater drain, preventing any rodents or bad smelling gasses from escaping.

Varieties of drainage gullies explained…

Here at PolyDrainage we provide 3 main types of gullies. We have P Trap gullies, Bottle gullies and Road Drainage gullies.

Drainage Road gully gratings

Bottle gullies come with a grid already attached, which matched the trap. However, if you have a road drainage gully you will require a separate grating. Our gully gratings are made from composite or ductile iron and are accessed via being hinged down or being able to be completely removable. 

Our gratings are into categories based on their load class. We have load classes A-F with each class referring to a different intended traffic level and weight. 

Below shows a breakdown of the grating load classes:

To put the load classes into perspective the average patio drainage fitting can use anything from load class A15 upwards, however a carriageway (road) needs to be a minimum load class of D400. 

Road drainage gullies – 

Road gullies are much larger than your bottle gully, however, the work in pretty much the same way. Our road gullies are made from plastic, creating a lightweight easy to use units. They act as liners for concreate castings, when all the correct pipework has been successfully connected. The concrete is used to provide extra strength and resist deformation.  

Road gullies are used to handle much heavier traffic in areas such as motorways, airports they are made with a trap that collects the sediment and stops any odours from getting out. Road gullies are used to hold rainwater, they are connected to the main drainage system, which will be discharged into a near by waterway. Road Gullies usually come with grids on top and an found along the side of most of the roads.

Gully Outlet | Polydrainage.co.uk

P trap gullies – 

P Trap gullies have been named for the P shaped bend in the centre , the reasoning behind this is brought to trap the water that flows into the gully. The water flows through the gully hopper and then enters a central chamber, connecting to the main drainage system. Having the bend in the middle of the system creates a barrier, stopping any gasses a foul smells getting out into the air. 

You can purchase P Trap bottle gullies in both 90° and 45°, they both function in similar ways. P Trap gullies usually come with a socket and rubber seal to allow you  to connect a pipe into it. However, sometimes they may arrive with out the need for a coupling to connect the gully to the drainpipe. 

The main difference between P Trap gullies and bottle gullies is that P Trap gullies are not roddable. 

PolyDrainage - 110mm Underground Low Back P Trap Gully

Bottle Gullies – 

The principle of bottle trap gullies are very similar to P Trap gullies. However, bottle gullies also known as compact, universal or yard gullies are distinctive for being roadable. This also means the central chambers within the trap are removable, making it much easier when you need to clean the gully, or remove any blockages. 

This is the more suited gully to homeowners as it is much easier to maintain, you can simply remove the trap, was it and replace it. 

Bottle gullies can come with either a fixed unit or with an adjustable top, which makes it easy for you to adjust the grid to the ground height. Plain ended gullies have one outlet to connect the gully to the sewage system. Back inlet gullies are designed to have an inlet on the back, allowing you to attach this to another drainage run. 

110mm Back Inlet Bottle Gully

Maintaining your gullies… 

To prevent any blockages in your gullies you need to keep up with the maintenance. It is suggested that you do so with seasonal checks, especially after a rainy or windy weather. Clearing out your gullies regularly is the key to ensuring your gullies last and an no unwanted smells arrive the gully will last as long as possible. 

However, if you are faced with a blockage, the method of removal is totally dependent on the type of gully installed. It is much easier to remove any blockages from a bottle gully due to the system being roddable and having a removable trap with an easy outlet pipe for access. To remove the blockage all you need to do is remove the chamber an insert your drainage rod this will allow you to dislodge the blockage. 

A P Trap gully on the other hand is a much harder unblocking. You will need to use a drainage specialist as they are more than likely going to use electronic mechanical pipe cleaning. 

Three elements make up sustainable drainage systems: prevention, drainage maintenance, and drainage. Here is how they function:

Drainage: This component of a sustainable drainage system collects rainwater from your lawn, directs it away from waterways and other sensitive areas, and stores it until it can be absorbed into the ground where it belongs.

Drainage Maintenance: This step in maintaining a sustainable drainage system entail keeping the area surrounding your home free of obstructions so that water won’t collect in one place or leak into pipelines and underground pipes.

Prevention: By collaborating with plants that naturally reduce run-off water before it reaches neighboring waterways and sensitive regions like stream banks or wetlands, this component of a sustainable drainage system helps prevent erosion.

How does it work?

The natural processes that take place when rainwater hits the ground are utilised by a sustainable drainage system. When precipitation contacts soil, it reacts with oxygen in the atmosphere and changes back into water. Our bodies receive nourishment from the food and liquids we consume through a process known as groundwater recharge.

Instead of flowing down a storm drain or directly into our waterways, where it may pollute them or be consumed by fish, the water in a sustainable drainage system returns to our subterranean water supply.

Why choose sustainable drainage systems?

A sustainable drainage system is a simple solution to reduce storm water runoff and improve the environmental friendliness of your home.

Does having a sustainable drainage system really help the environment?

A wonderful approach to save water is to install a sustainable drainage system. The main advantage of a sustainable drainage system is that it minimizes the volume of water that runs off your property into storm drains, which can cause flooding and erosion.

Main Benefits or using a sustainable drainage system:

Reduced runoff: A sustainable drainage system aids in reducing runoff by lowering the amount of precipitation that falls on your property annually, which can cause erosion and floods during periods of severe precipitation. By keeping pollutants out of waterways, sustainable drainage systems also aid in reducing pollution in nearby watersheds.

Water Conservation: A good strategy to save water is to install a sustainable drainage system. A sustainable drainage system’s key advantage is that it lessens the quantity of water that leaves your property and goes into storm drains, which can prevent erosion and flooding.

Additionally, a sustainable drainage system lessens the quantity of runoff into lakes, rivers, and streams. This translates into less waste being dumped into waterways and less damage being done to aquatic ecosystems.

Reduced Threats from Flooding: When compared to conventional solutions like earth dams or levees, a sustainable drainage system is more effective in preventing flooding, which helps shield your property from rising waters. Sustainability means that these systems can be constructed using components that are widely accessible across the nation, this means that their cost won’t be significantly greater than that of traditional alternatives.

Pollution Reduction: By lowering runoff from unmaintained areas like parking lots, highways, and other surfaces, a sustainable drainage system reduces pollutants. Additionally, it promotes stormwater infiltration so that runoff or stormwater overflow can be prevented, and the water can be absorbed by the soil and plants.

Soil Health: Sustainable drainage systems are fantastic for soil health because they reduce the quantity of surface water that drains off your land, which helps control excess runoff from your property. To prevent soil nutrients from evaporating into surrounding streams or draining away into subsurface aquifers, sustainable drainage solutions also help maintain soil nutrients in situ.

A sustainable drainage system has environmental advantages, but it can also increase crop yields by enhancing plant health and giving plants on your property better access to sunlight.

The Social Benefits of sustainable drainage systems: There are numerous ways in which a sustainable drainage system can benefit society and the environment. Reduced storm water runoff into nearby rivers during heavy rains, which can impact water quality and wildlife habitat, is one approach to do this (see above). It also benefits society by giving local workers jobs installing new drains.


Sustainable drainage systems have benefits for the ecosystem beyond just being good for the environment. They should be considered in your design plans for a variety of reasons, including less runoff and soil erosion as well as increased property value. Sustainable drainage systems are not just a passing fad; rather, they are an integral aspect of the growing sustainability movement that will affect all projects, large and small.

If you would like to receive any extra information surrounding our drainage pipes, you can send us an email at sales@polydrainage.co.uk

It goes without saying that flooding and severe weather can have a disastrous effect on the drainage system of your property.

The damage brought on by extreme weather can range from backed-up sewer lines to clogged gutters and downspouts, and it can be costly to fix.

Thankfully, there are precautions you may take to shield your drains from Mother Nature. Spending a little time preparing your drains for bad weather and flooding might help you avoid having to make expensive repairs later on. Any severe or out-of-season weather occurrence that results in property damage or fatalities is an extreme weather event, along with flooding. The most frequent sort of extreme weather is flooding, which can be brought on by strong rainfall, melting snow, flash floods, and broken dams. Tornadoes, hurricanes, thunderstorms, winter storms, and heat waves are all examples of extreme weather.

How to protect your drains…

Regularly having your drains professionally cleaned is one of the best methods to shield them from severe weather. Water can back up into your property as a result of clogged gutters and downspouts, causing significant water damage.

A professional drain cleaning business will have the equipment and knowledge required to clear your gutters and downspouts of any debris, ensuring that they can withstand even the heaviest downpours.

Alongside having your gutters and downspouts cleaned, you should take precautions to make sure that tree roots aren’t posing a threat to your sewer line. As they can grow into pipe cracks and obstruct sewage flow, tree roots are one of the most frequent reasons for clogged sewer systems.

Have a professional plumber evaluate the situation as soon as you can if you think tree roots may be interfering with your sewer line. Tree roots may often be cut without harming the pipe, but if they are too big or deeply ingrained, it might be required to replace the sewer line entirely.

Finally, if you live in a flood-prone area, you should take precautions to prevent water damage to your home’s foundation. The dirt around your foundation can be quickly eroded away by flood waters, leading to gaps that eventually let water into your basement or crawlspace.

You can help protect your drains from bad weather and flooding by following these easy actions. Regular maintenance and professional drain cleaning can greatly reduce the likelihood of future costly issues. Additionally, installing a sump pump can keep your foundation dry during even the worst floods if you reside in a flood-prone area. You can help protect your house from damage even during the most extreme weather conditions by acting right away.

The Problems caused by server weather.

Extreme weather conditions can cause drainage systems to flow more water than they are intended to, which may also create issues.

Storm drains can become overloaded by flash flooding and backed-up sewers due to heavy rains. Water may therefore back up into residences and establishments, causing significant harm. Extreme weather conditions have the potential to jeopardize people’s health in addition to causing physical harm. Sewage, chemical waste, and debris are just a few of the toxins that floodwaters might pick up when they flood a region. If this contaminated water encounters people or animals, it may subsequently spread diseases.

There are several strategies to protect against drainage issues brought on by severe weather. One is to make sure that your house or place of business has a drainage system that can handle the volume of water that is anticipated during a storm.

Another is to stay away from constructing in flood-prone locations. Finally, it’s critical to be aware of the dangers posed by extreme weather and to take precautions to shield your home and belongings from harm.

If you would like to receive any extra information surrounding our drainage pipes, you can contact email at sales@polydrainage.co.uk

Underground drainage pipes, Ducting coils, and MDPE are just some of the drainage pipes supplied at PolyDrainage. To make it easier for our customers we split them up into separate categories by pipe diameter, price, and application.  

EN1401 Drainage pipes –

Supplied by MagnaPlast we offer a huge range of underground drainage pipes and fittings in 110mm & 160mm diameters.

These lightweight soil pipes and manufactured from PVC-U, allowing for strength and durability. As well as this, it creates a manageable product, suitable for high-temperature waste discharges.

To Shop our range of EN1401 Drainage pipes & accessories click here

MDPE Pipe –

Here at PolyDrainage, we supply MDPE pipe coils in a variety of different sizes in blue, black, and yellow. Our MDPE has been designed for maximum jointing integrity and is the ideal solution for new installations, pipeline replacements, and rehabilitation.

MDPE is quick and easy to install, and they can be supplied in longer lengths,  reducing the number of joints required in the system, and are a cost-effective alternative to concrete or metallic pipelines.

To shop our range of MDPE pipe & accessories, click here.

Ducting Coils

Underground ducting coils are used to protect any essential utilities, used for buildings in domestic or commercial areas.  These utilities range from gas, water, electricity, phone lines and internet.

Our ducting coils are stocked in 63mm & 110mm diameters. 

Below is a breakdown of the ducting coils available at PolyDrainage, and what they can be used for…

Orange Ducting

Used to protect cables streetlights and traffic signals. 

Blue Ducting

Used to protect Water service pipes. 

Green Ducting

Used to protect any cables/ wires linked to CCTV. 

Yellow Ducting

Used to protect and cover any gas lines. 

Black Ducting

Used to protect and cover any cables linked to electricity.

To shop our range of Ducting coils & accessories, click here.

Ducting Coils

If you would like to receive any extra information surrounding our drainage pipes, you can an email at sales@polydrainage.co.uk

Green Drain is now available to purchase! It is a globally multi-patented floor drain solution that allows the water to flow while blocking pathogens, gases, odours & pests. Currently it is the only product on the market that can protect businesses from pathogens like COVID-19.

It works by opening there valve to allow drainage water to pass through and close when there is no water flow. It can be used in either new construction or retrofit applications where trap primers were never installed.

The four flexible silicone sealing ribs ensure easy installation into openings that have variations in size. The green drain will open to allow drainage and close when there is no water flow and can be used in either new construction or retrofit applications where trap primers were never installed.

The product reduces exposure to hazardous sewer gases and disease-causing pathogens that harbor within drain lines and plumbing systems.  Our eco-friendly, preventative solution leads to improved outcomes for worker & patient health, while simultaneously exceeding the lifespan of traditional chemical applicants that harm the environment. Order this waterless trap seal today.

The Green Drain Prevents-

Product benefits: 

Product Features: 

You can find the product by clicking here.

For more information on Green Drain take a look at their website by clicking here.