D4551 Adjustable Relief Valve Body Material Bronze Inlet Type MNPT Outlet Type FNPT Inlet Size 1 1/4 in Outlet Size 1 1/4 in Factory Set Pressure 50 psi Pressure Range 31 to 50 psi Disc Material Bronze Overall Height 8 1/2 in Application Liquids Seat Material Bronze Spring Material 316 Stainless Steel Temp Range 0 Degrees to 450 Degrees F Test Lever No