D4558 Adjustable Relief Valve Body Material Bronze Inlet Type MNPT Outlet Type FNPT Inlet Size 1 1/2 in Outlet Size 1 1/2 in Factory Set Pressure 300 psi Pressure Range 251 to 300 psi Disc Material 316 Stainless Steel Overall Height 9 3/4 in Application Liquids Seat Material 316 Stainless Steel Spring Material 316 Stainless Steel Temp Range 0 Degrees to 450 Degrees F Test Lever No