The WaStop Inline check valve installs in stormwater systems and outlets, providing immediate protection against flooding and backflow. Its unique, simple, and effective design also prevents unwanted odour, especially at outlets in tidal environments. The standard variant is supplied with an EPDM gasket and mounting tabs. Technical specification Nominal diameter DN 900 (NPS 36) Max. Flow Velocity 4 m/s (13.1 fps) Weight 125 kg (275.6 lb) # Bolt holes (#B) 12 Bolt Circle Diameter (BCD) 1040 mm (40.9 in) Dimension 885 mm (34.8 in) Valve body length (L) 1700 mm (66.9 in) Outer Ø (OD) 885 mm (34.8 in) Ø Bolt Holes (ØB) 13 mm (0.5 in) Max. Flow Volume 2546 l/s (40354.9 GPM) Max. ID Host Pipe 912 mm (35.9 in) Min. ID Host Pipe 890 mm (35 in) Flange bolt pattern wapro Fasteners mtrl. 316L stainless steel Product sheet (PDF) Technical specification (PDF) Dimensional drawing (PDF)