Unloader Valve, Regulating, Flow Range .25-7.8 GPM, Max. Fluid Temp. 190 F, Body Material 303 Stainless Steel, Inlet Port (In.) 3/8 Female, Outlet Port (In.) 3/8 Female, Max. Pressure 3650 PSI, Height 6 3/4 In., Protects Pump and System Components from Surge Shock Damage that Can Often Occur When Spray Guns are Shut Off at High Pressure