This PENTAIR KUNKLE VALVE safety relief valve is factory preset and sealed to help prevent tampering, and features a pivot between the disc and spring to help correct misalignment. Not adjustable. Item: Safety Relief Valve Body Material: Bronze Inlet Type: MNPT Outlet Type: FNPT Inlet Size: 1" Outlet Size: 1-1/4" Factory Set Pressure: 100 psi Disc Material: B21 Alloy 485 Overall Height: 8-1/2" Application: Steam Boiler and Generators, Pressure Reducing Stations etc Overall Length: 4" Seat Material: EPR Spring Material: Stainless Steel Temp. Range: -60 Degrees to 406 Degrees F Test Lever: Yes Standards: ASTM A-313 TY 631, ASME Section 1, Steam, National Board Certified