Product details:

Series 69 Relief Valves Max. temp.: 450 F Field-adjustable pressure is factory set to midrange for minimal effect on flow capacity rates. Adjustment requires no disassembly; simply remove hex cap. Closed bonnet, sealed hex cap, and lapped metal seating eliminate leakage. Stainless steel springs. MNPT x FNPT connections. For pressure relief, liquid relief, continuous bypass, and overprotection for pumping stations, tanks, hydraulics, fluid, and pipelines. This listing is for each. Technical Specification Item 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 250 psi Pressure Range 201 to 250 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