Apollo Valves 511GFBKMAA0075 Multi-Purpose Safety Relief ValveValves are factory preset and sealed to prevent tampering.Not adjustable. MNPT x FNPT connections.High-capacity, full-nozzle design can be used in closed systems where discharge must be contained.Metal-to-metal seating.Apollo Valves 511GFBKMAA0075 Multi-Purpose Safety Relief Valve Features: POP Safety Valve Inlet/Outlet 1 1/4 x 2 In MNPT x FNPT Connection Material of Construction Bronze Preset Setting 75 PSI Pressure Range 5 To 300 PSI Temp Range -60 To 406 F Standards ASME Section VIII UV NB CSA CRN