Watts 3/4 in. D X 3/4 in. D Threaded Brass Double Check Valve

Series LF7R Lead-free dual check valves prevent the reverse flow of liquids in a plumbing system from entering the drinking water supply where there is a non-health hazard. Designed for residential water system containment at the service entrance or individual outlets. They can be installed immediately downstream of the residential meter in a horizontal or vertical position.