Mercer Valve P/N 91-74H11V78U1, Series 9100, Connections 1-1/2"600#RF x 3"150#RF, Orifice H, Seat Viton, Inlet and Body Carbon Steel, PSIG Pressure Limit 1480, Top Closed, Service Gas, PSIG Setting Range 86-140, Soft Seat Safety Relief Valve