About the Watts 0061935 1/2" F9D-M3 DCV Backflow Preventer
Watts 0061935 1/2" F9D-M3 Double Check Valve Backflow Preventer. The D9, D9C Series Dual Check Valves are designed to prevent reverse flow of used and dirty water from entering back into the potable water supply system. Series D9, D9C . It consists of a brass body construction with an atmospheric vent, and NPT female inlet and outlet connections. Series D9 and D9C are designed for non-health hazard, continuous pressure applications. Series D9C comes with chrome plated finish.