This dual check valve, 3/8 inch, prevents the reverse flow of polluted water from entering into the drinking water supply at the service entrance or at individual outlets. It is designed for in-line continuous pressure applications, such as wash-down sinks or other installations, where a hose type device connected to the domestic water supply can be submerged into a non-potable liquid. It consists of a chrome-nickel plated lead free brass body, 3/8 union NPT thread female inlet by NPT thread female outlet, Buna-N seals, two plastic replaceable check valves, silicone discs, and stainless steel springs. The minimum working pressure is 10 PSI (69 kPa) and the maximum working pressure is 150 PSI (10 BAR).