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 100 (NPS 4) Max. Flow Velocity 2 m/s (6.6 fps) Weight 1.5 kg (3.3 lb) # Bolt holes (#B) 6 Bolt Circle Diameter (BCD) 210 mm (8.3 in) Dimension 96 mm (3.8 in) Valve body length (L) 210 mm (8.3 in) Outer Ø (OD) 96 mm (3.8 in) Ø Bolt Holes (ØB) 9 mm (0.4 in) Max. Flow Volume 16 l/s (253.6 GPM) Max. ID Host Pipe 106 mm (4.2 in) Min. ID Host Pipe 98 mm (3.9 in) Flange bolt pattern wapro Watertightness EN 13564 Fasteners mtrl. 316L stainless steel Product sheet (PDF) Technical specification (PDF) Dimensional drawing (PDF)