PrintPre-set Relief Valves Versatile and manually adjustable, these valves protect the pipeline by relieving pressure in a system. Specs/Part #s Approx. Wt. Lbs. Size Pressure Relief Setting Model Number .330 1/2"M x 1/2"F 75 PSI RV16202 .375 3/4"M x 1/2"F RV16203