The WaStop check valve installs in stormwater systems, providing immediate protection against flooding and backflow. Its unique, simple, and effective design also prevents unwanted odour and pest intrusion. This model features a flange for bolting onto a head wall, ensuring secure and fast installation. Technical specification Nominal diameter DN 800 (NPS 32) Max. Flow Velocity 4 m/s (13.1 fps) Weight 102 kg (224.9 lb) # Bolt holes (#B) 6 Bolt Circle Diameter (BCD) 920 mm (36.2 in) Dimension 790 mm (31.1 in) Valve body length (L) 1500 mm (59.1 in) Outer Ø (OD) 790 mm (31.1 in) Ø Bolt Holes (ØB) 13 mm (0.5 in) Max. Flow Volume 2012 l/s (31890.8 GPM) Max. ID Host Pipe 807 mm (31.8 in) Min. ID Host Pipe 795 mm (31.3 in) Flange bolt pattern Wapro Fasteners mtrl. 316L stainless steel Product sheet (PDF) Technical specification (PDF) Dimensional drawing (PDF)