Model 1049 Rev A Pilot Operated Vent Valve; Stainless Steel Body; 2" Inlet X 3" Outlet Mates With ASME 150 Flanged End Connections; FFKM 2 Soft Seats; Option 1: Internal Sensing With Pilot Exhaust Tubed To Main Valve Outlet; FEP Actuator Diaphragm; 4.0" - 12.0" wc Pressure Range