Model 1049 Rev A; SALES KIT; Pilot Operated Vent Valve; Stainless Steel Body; 2" Inlet X 3" Outlet Mates With ASME 150 Flanged End Connections; FFKM 1 Soft Seats; Fluorocarbon Elastomer (FKM) Actuator Diaphragm With FEP Liners; 1.2 - 4.0" wc Low Pressure Range With Special External Air Assist Pilot