The Clear opening plastic inspection chamber base is suitable for use with products CDU355 & cd352.It has a 5 Way 110mm stepped design inlet system made for flexibility. It Comes complete with 3 easy fit bungs to block off unused inlets. Maximum depth allowed by building regulations is 600mm.

Manufactured by Clark Drain using black polypropylene and EPDM rubber

External dimensions 478mm diameter x 220mm high

Load rating classification of 35kn (3.5 tonnes)

Product weight 2kg

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

Plastic non-rusting design


5-way ‘stepped’ design for system flexibility

Easy-fit bungs to block off unused inlets

Total depth can be up to 0.4m using matching CD U354 riser, or 0.6m using matching CD U355 riser

Range of matching manhole covers available to suit most applications