Suitable for residential, commercial, industrial, irrigation, marine and fire protection applications, Prevents the reverse flow of water, gases or other substances into the distribution system of the potable water supply, Double check valve assembly complete with two full port valves and four ball valve test cocks, Bronze body construction, Noryl replaceable seats and silicone rubber check discs, Entire unit serviceable in-line, Temp range 33F to 180F, Maximum pressure 175 psi, Size: 3/4"", Listed ASSE 1015, AWWA, SKU: HMREX1651