Mercer Valve P/N 91-74H11T88C1, Series 9100, Connections 1-1/2"600#RF x 3"150#RF, Orifice H, Seat Teflon, Inlet and Body Carbon Steel, PSIG Pressure Limit 1480, Top Closed, Service Gas, PSIG Setting Range 1051-1450, Soft Seat Safety Relief Valve