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 200 (NPS 8) Max. Flow Velocity 2 m/s (6.6 fps) Weight 6.4 kg (14.1 lb) # Bolt holes (#B) 8 Bolt Circle Diameter (BCD) 325 mm (12.8 in) Dimension 215 mm (8.5 in) Valve body length (L) 450 mm (17.7 in) Outer Ø (OD) 215 mm (8.5 in) Ø Bolt Holes (ØB) 9 mm (0.4 in) Max. Flow Volume 80 l/s (1268 GPM) Max. ID Host Pipe 233 mm (9.2 in) Min. ID Host Pipe 216 mm (8.5 in) Flange bolt pattern Wapro Fasteners mtrl. 316L stainless steel Product sheet (PDF) Technical specification (PDF) Dimensional drawing (PDF)