Polypropylene Access Chambers and Maintenance Shafts


This WaterMark Technical Specification sets out requirements for the design, manufacture and performance of polypropylene Access Chambers / Maintenance Shafts comprising an injection-moulded chamber for jointing to extruded PVC-U sewers or drains and riser shafts.

An Access Chamber / Maintenance Shaft is intended for installation in plumbing, sewerage and drainage systems (up to DN 225) for transportation of sewage or storm water to operate at atmospheric pressure where the depth of burial, from the invert to the ground surface, is not greater than 4 m and the operating temperature is not greater than a nominal 25°C. Long-term design criteria limits are 50 year extrapolated or predicted values.

Cover image: WaterMark Technical Specification 509 2018

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