WILKINS DOUBLE CHECK VALVE BACKFLOW PREVENTER 1"* Suitable for residential commercial industrial irrigation marine and fire protection applications Preven ts the reverse flow of water gases or other substances into the distribution system of the potable water supp ly 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 33?°F to 180?°F Maximum pressure 175 psi Listed ASSE 1015 AWWA