Model 1049 Rev A Pilot Operated Vent Valve; Carbon Steel Body; 2" Inlet X 3" Outlet, Mates With ASME 150 RF Flanged End Connections; FFKM 1 Soft Seats; Standard Configuration With Internal Sensing And Pilot Exhaust To Atmosphere; EPDM Actuator Diaphragm; 4.0" - 12.0" wc Pressure Range