The inspection chamber riser has a clear plastic opening with a 400mm effective height.and is suitable for use with products CDU353 & CD352. Simple to use by cutting to suit desired installation depth. Supplied complete with 1 number EDPM rubber sealing ring. Maximum depth allowed by building regulations is 600mm.


Manufactured by Clark Drain using black polypropylene and EPDM rubber

External dimensions 355mm diameter x 440mm high

Load rating classification of 35kn (3.5 tonnes)

Product weight 2.6kg

Compliant to relevant clause of BS EN 13598-1:2010



Compliant to relevant clauses of BS EN13598-1:2010 and Sewers for Adoption, 7th Edition

All-plastic non-rusting design


Supplied with joint seal

Made from recycled material

Total depth can be up to 0.6m when used with matching CD U351 or CD U353 chamber base

Compatible with CD 300, CD 300SR, CD 352 & CD 356 manhole covers as-supplied

Compatible with CD 300 & CD 300SR manhole covers if cut-down to custom height