Safety Relief Valve Body Material Brass Inlet Type MNPT Outlet Type FNPT Inlet Size 3/4 in Outlet Size 3/4 in Factory Set Pressure 30 psi 510 000 BtuH Disc Material Silicone Overall Height 3 11/32 in Application Hot Water Space Heating Boilers Water Supply Heaters and Storage Tanks. Overall Length 3 11/32 in Seat Material Silicone Spring Material Stainless Steel Temp Range 0 Degrees to 250 Degrees F Test Lever Yes Compliance ASME Section IV Standards ASME Section 1V