Safety Relief Valve, Body Material Bronze, Inlet Type FNPT, Outlet Type FNPT, Inlet Size 3/4 in, Outlet Size 3/4 in, Factory Set Pressure 30 psi, Pressure Range 30 to 150 psi, 650,000 BtuH BtuH, Overall Height 5 1/8 in, Application For Pressure Protection of Hot Water Heating Boilers, Overall Length 2 1/2 in, Seat Material Metal, Spring Material Stainless Steel, Temp. Range 0 Degrees to 250 Degrees F, Test Lever Test Lever Included, Standards MILV-136-RD, Type III, Rating ASME. NB and HV