Mercer Valve P/N 91-47H11T82U1, Series 9100, Connections 2"300#RF x 2-1/2"150#RF, Orifice H, Seat Teflon, Inlet and Body Carbon Steel, PSIG Pressure Limit 740, Top Closed, Service Gas, PSIG Setting Range 221-450, Soft Seat Safety Relief Valve