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Inspection Chambers & What they are used for?

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