WM Specification File
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This WaterMark Technical Specification sets out requirements for plastics-bodied reflux valves manufactured from PVC-U (Polyvinyl Chloride Unplasticised) and ABS (Acrylonitrile Butadiene Styrene), that are intended to prevent the reversal of waste water flow by means of a resilient-seated disc/flap or other mechanism. It covers nominal sizes DN 100 to DN 600.

Licences evaluated under this specification

WM Certificates associated with this Specification

Certificate Current Certification Date Current Expiry Date Status
000502 3 Nov 2025 3 Nov 2030 Active
023090 16 Aug 2025 16 Aug 2030 Active
023075 3 Feb 2025 3 Feb 2030 Active
074826 6 Sep 2024 6 Sep 2029 Active
000540 26 Apr 2024 26 Apr 2026 Active