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 150 (NPS 6) Max. Flow Velocity 2 m/s (6.6 fps) Weight 3 kg (6.6 lb) # Bolt holes (#B) 8 Bolt Circle Diameter (BCD) 250 mm (9.8 in) Dimension 144.5 mm (5.7 in) Valve body length (L) 300 mm (11.8 in) Outer Ø (OD) 144.5 mm (5.7 in) Ø Bolt Holes (ØB) 9 mm (0.4 in) Max. Flow Volume 36 l/s (570.6 GPM) Max. ID Host Pipe 159 mm (6.3 in) Min. ID Host Pipe 146 mm (5.7 in) Flange bolt pattern wapro Watertightness EN 13564 Fasteners mtrl. 316L stainless steel Product sheet (PDF) Technical specification (PDF) Dimensional drawing (PDF)