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 600 (NPS 24) Max. Flow Velocity 4 m/s (13.1 fps) Weight 54 kg (119 lb) # Bolt holes (#B) 12 Bolt Circle Diameter (BCD) 720 mm (28.3 in) Dimension 587 mm (23.1 in) Valve body length (L) 1140 mm (44.9 in) Outer Ø (OD) 587 mm (23.1 in) Ø Bolt Holes (ØB) 13 mm (0.5 in) Max. Flow Volume 1132 l/s (17942.6 GPM) Max. ID Host Pipe 613 mm (24.1 in) Min. ID Host Pipe 590 mm (23.2 in) Flange bolt pattern Wapro Fasteners mtrl. 316L stainless steel Product sheet (PDF) Technical specification (PDF) Dimensional drawing (PDF)