SALES A KIT; Model 1049 Rev A Pilot Operated Vent Valve; Carbon Steel Body; 3" Inlet X 4" Outlet Mates With ASME 150 Flanged End Connections; FFKM 1 Soft Seats; Option 1: Internal Sensing With Pilot Exhaust Tubed To Main Valve Outlet; BUNA-N Actuator Diaphragm With FEP Liners