Mercer Valve P/N 91-13C11T11C1, Series 9100, Connections 3/4"600#RF x 1"150#RF, Orifice C, Seat Teflon, Inlet and Body Carbon Steel, PSIG Pressure Limit 1480, Top Closed, Service Gas, PSIG Setting Range 801-1480, Soft Seat Safety Relief Valve