Mercer Valve P/N 91-06D51T63I1, Series 9100, Connections 1/2"MNPT x 1"FNPT, Orifice D, Seat Teflon, Inlet and Body Carbon Steel, PSIG Pressure Limit 1480, Top Closed, Service Gas, PSIG Setting Range 1301-1480, Soft Seat Safety Relief Valve