Model 1049 Rev A Pilot Operated Vent Valve; Carbon Steel Body; 2" Inlet X 3" Outlet Mates With ASME 150 Flanged End Connections; EPDM Soft Seats; Option 10: Internal Sensing With Pilot Exhaust Tubed To Main Valve Outlet And Backflow Preventer; FEP Actuator Diaphragm; 4.0" - 12.0" wc Pressure Range