WM Specification File
This WaterMark Technical Specification sets out requirements for a plastic bodied DN 100 overflow relief waste outlet (ORWO) with integral cap-stopper.

The intended function of the waste fitting is to limit stormwater entry to sewer systems in order to prevent flood water damage to Network Utilities Operator infrastructure yet provide overflow relief in the event of sewer surcharge when installed in conjunction with an overflow relief gully.

ORWOs with integral cap-stoppers require certification to WaterMark Level 2.

Licences evaluated under this specification