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This 1 in pressure vacuum breaker is used to protect against health hazard and non-hazard backsiphonage of toxic or non-toxic liquids in industrial plants cooling tower laboratories laundries swimming pools and irrigation systems. It has a bronze body spring loaded check valve air relief valve with opening port two resilient seated shutoffs and test cocks and NPT end connections. This assembly meets the specifications of the USC FCCC and HR Manual. The maximum working pressure is 150 psi 10.3 bar and temperature range is 32 to 140 deg F 0 to 60 deg C.