The AVG Dual Check Valve F.I x F.I is a backflow prevention valve to stop reverse flow and protect potable water supplies from contamination. Manufactured from DR Brass with two spring loaded check valves that remain closed until water flows downstream. Suitable for; potable water systems, meter connections and low hazard backflow prevention installations. Maximum working pressure of 1500 kPa and an operating temperature range if 1ºC to 80ºC.