Apollo Valves 541DDBKMAA0150 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 541DDBKMAA0150 Multi-Purpose Safety Relief Valve Features: POP Safety Valve Inlet/Outlet 3/4 x 1 In MNPT x FNPT Connection Material of Construction 316 Stainless Steel Preset Setting 150 PSI Pressure Range 8 To 900 PSI Temp Range -60 To 800 F Standards ASME Section VIII UV NB CSA CRN