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 450 (NPS 18) Max. Flow Velocity 3 m/s (9.8 fps) Weight 25 kg (55.1 lb) # Bolt holes (#B) 4 Bolt Circle Diameter (BCD) 585 mm (23 in) Dimension 443 mm (17.4 in) Valve body length (L) 840 mm (33.1 in) Outer Ø (OD) 443 mm (17.4 in) OD incl. gasket (ODG) 467 mm (18.4 in) Ø Bolt Holes (ØB) 10.5 mm (0.4 in) Max. Flow Volume 478 l/s (7576.5 GPM) Max. ID Host Pipe 464 mm (18.3 in) Min. ID Host Pipe 446 mm (17.6 in) Fasteners mtrl. 316L stainless steel Gasket EPDM Product sheet (PDF) Technical specification (PDF) Dimensional drawing (PDF)