Raising Piece

Our raising pieces are in 320mm and 470mm sizes, which are designed to fit with either 320mm inspection chambers, or 470mm inspection chambers.

Our 110mm Inspection Chambers Base is available with a 320mm base and riser or a 470mm base and riser.  The 110mm Inspection Chambers in 320mm are suitable for depths of up to 600mm, and 3000mm for the 470mm.

The invert (depth) for the our risers and chambers are:

320 BASE = 185mm 320 RISER = 140mm

470 BASE = 225mm 470 RISER = 235mm

Our bases and risers are manufactured to BS EN 1401-1 BS4660 2000, the base inlets are compatible with the following underground drainage systems:

HEPWORTH 110mm

FLOPLAST 110mm

BRETT MARTIN 110mm

OSMA/WAVIN 110mm

POLYPIPE 110mm

MARLEY 110mm

HUNTER 110mm

Our 110mm Underground Drainage Systems are designed for use in gravity drainage and sewerage applications, up to a depth of 10M.