Plastic chamber is a kind of well made of plastic, some are very large, people can enter, some are very small, can only wear cables. At present, our plastic well is made of SMC, which has the characteristics of light weight and high strength. In China, this kind of plastic well is widely used in construction sites.

A manhole, or inspection chamber, is an access point to an underground utility network, such as a drainage system. The presence of a drain or sewer manhole allows the underground pipes to be inspected, surveyed, unblocked, cleaned, or repaired.

Guidance on the design, location, and structure of manhole and inspection chambers is governed in the UK by Building Regulations. Manhole chambers are typically located at one of three points in a drainage system:

Where a branch drain joins a main drainage pipe in the system
When there is a straight run of piping for more than 22 metres
Where a drain or sewer pipe changes direction horizontally by more than 30 degrees
As well as giving access to drains and sewers, manhole chambers are an important temporary storage point for water. They allow water to build up in the drainage system rather than flood out straight away.

While working on pipe systems, drainage engineers may deliberately block a pipe and use the manhole in the same way, to store waste water before letting it flow away once the drainage task is complete.