Inspection Chamber Manhole 450mm set

Amazon Civils base, riser, lid and frames are manufactured 

from 100% polypropylene. All installations should

 conform to building practices as laid down by 

the relevant local authority BS EN 1329

450mm Inspection chambers can be installed

 to a maximum depth of 1200mm, all outlets are 110mm.

Ensure silicone sealant is used to fit the first riser

 to manhole base and in subsequent riser-to-riser jointing