Our raising pieces are in 320mm and 470mm sizes, which are designed to fit with either 320mm inspection chambers, or 470mm inspection chambers. 110mm Inspection Chambers in 320mm are suitable for depths of 600mm, and 3000mm for the 470mm.
Our 110mm Inspection Chambers Base is available with a 320mm base and riser or a 470mm base and riser.
The invert (depth) for the our risers and chambers are:
320 BASE = 185mm
320 RISER = 140mm
470 BASE = 225mm
470 RISER = 235mm
Our raising pieces are manufactured to BS EN 1401-1 BS4660..2000, they are compatible with the following underground drainage systems:
BRETT MARTIN 110mm
Our 110mm Underground Drainage Systems are designed for use in gravity drainage and sewerage applications, up to a depth of 10M. All of our drainage pipes and the majority of fittings are manufactured from Polyvinyl Chloride (PVC-U). The inspection chambers and gully grids are manufactured from polypropylene.