Description
The 280mm manhole riser 185mm high is used to build up the height of a compatible 280mm shallow access chamber. It helps bring the chamber cover closer to the finished ground level while keeping access available for inspection, rodding and maintenance.
This Brett Martin B2801 riser is part of the 280mm shallow access chamber range for 110mm underground drainage layouts. It is suitable for domestic drainage, extensions, garden drainage, outbuildings, repairs and light-duty site drainage work.
The riser fits between a compatible 280mm chamber base and cover assembly. Therefore, it is useful when the chamber needs extra height to suit the installation depth.
280mm Manhole Riser for Shallow Access Chambers
The 280mm manhole riser is designed for compatible Brett Martin 280mm shallow access chamber assemblies. It allows the chamber height to be increased in stages while keeping the chamber accessible after installation.
Brett Martin lists the B2801 as a 280mm shallow access riser. The 280mm shallow access chamber assembly is used in 110mm drainage layouts and can be built up with compatible bases, risers and covers.
- 280mm manhole riser
- 185mm high riser section
- Brett Martin B2801 product reference
- Designed for 280mm shallow access chamber assemblies
- Suitable for 110mm underground drainage layouts
- Used to increase chamber height
- Compatible with Brett Martin 280mm chamber bases and covers
- Useful for inspection, rodding and maintenance access
280mm Manhole Riser 185mm High
This 280mm manhole riser adds height to the chamber assembly, helping the cover and frame finish closer to the required ground level. It can be used with compatible Brett Martin 280mm shallow access chamber bases.
Before installation, check the chamber base, riser and cover are all compatible. Also, confirm the finished ground level, invert depth and cover loading requirement before fitting the chamber system.
For best results, clean the joint area before assembly and use suitable pipe lubricant on ring seal joints where required.
280mm Manhole Riser Installation Use
The 280mm manhole riser should be installed as part of a properly supported chamber system. Correct bedding, backfill and support help keep the chamber stable after installation.
The chamber should sit level, and the riser should connect securely to the chamber base or another compatible riser. Also, make sure the chamber remains accessible once the drainage work is complete.
Always follow the site specification and manufacturer guidance. The correct number of risers will depend on the chamber base, cover type and final invert depth.
Shallow Access Chamber Riser for Site Drainage
This riser is useful for builders, groundworkers, landscapers and drainage installers working on smaller underground drainage systems. It can be used on new installations, repairs, extensions and outbuilding drainage work.
This product is a riser only. It should be used with a compatible 280mm chamber base and suitable cover and frame.
Compatible 280mm Manhole Chamber Products
This 280mm manhole riser is part of the wider TWS 280mm manhole inspection chamber range. It can be matched with compatible chamber bases, sealed covers, 110mm drainage pipe and underground drainage fittings.
View 280mm manhole inspection chambers at TWS.
View 110mm manhole inspection chambers at TWS.
View all manhole bases and inspection chambers at TWS.
Shop all underground drainage at TWS.
For official manufacturer information, see the Brett Martin access and inspection chambers information.
