Watts 757-BFG 0111536 4 inch Flanged Inlet x 4 inch Grooved Outlet Stainless Steel Body Dual Check Backflow Preventer with Butterfly Valves

This lead free double check valve assembly is designed to prevent the reverse flow of water of non-potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements. It is ideal for protection at cross-connections identified as non-health hazards and from other contaminants found at the service line entrance. This compact modular design with a single access sleeve for easy maintenance is approved for horizontal or vertical installation in accordance with the direction of the flow arrow on the assembly. It consists of a stainless steel body, tri-link check valves, grooved gear operated butterfly valves with tamper switch, and test cocks.