Model 1049 Rev A Pilot Operated Vent Valve; Carbon Steel Body; 10" Inlet X 12" Outlet Mates With ASME 150 Flanged End Connections; EPDM Soft Seats; Standard Configuration With Internal Sensing And Pilot Exhaust To Atmosphere; EPDM Actuator Diaphragm; 18.1" - 36.0" wc Pressure Range