Watts 3" 757 Double Check Valve Assembly (OSY)

Series 757, 757N Double Check Valve Assemblies are used to prevent backflow of non-health hazard pollutants that are objectionable but not toxic, from entering the potable water supply system. Series 757, 757N may be installed under continuous pressure service and may be subjected to backpressure and backsiphonage. Series 757, 757N consists of two independently operating check valves, two shutoff valves, and four test cocks. Features Extremely compact design 70% Lighter than traditional designs 304 (Schedule 40) Stainless steel housing & sleeve Groove fittings allow integral pipeline adjustment Patented tri-link check provides lowest pressure loss Unmatched ease of serviceability Replaceable check disc rubber