Model 1049 Rev A Pilot Operated Vent Valve; Carbon Steel Body; 2" Inlet X 3" Outlet Mates With ASME 150 Flanged End Connections; Fluorocarbon Elastomer (FKM) Soft Seats; Option 2: Remote Sensing With Pilot Exhaust To Atmosphere; Fluorocarbon Elastomer (FKM) Actuator Diaphragm; 18.1" - 36.0" wc Pressure Range