Model 1049 Rev A Pilot Operated Vent Valve; Carbon Steel Body; 2" Inlet X 3" Outlet Mates With ASME 150 Flanged End Connections; FFKM 2 Soft Seats; Option 10: Internal Sensing With Pilot Exhaust Tubed To Main Valve Outlet And Backflow Preventer; Fluorocarbon Elastomer (FKM) Actuator Diaphragm With FEP Liners; 18.1" - 36.0" wc Pressure Range