Model 1049 Rev A Pilot Operated Vent Valve; Carbon Steel Body; 2" Inlet X 3" Outlet, Mates With ASME 150 Flanged End Connections; FFKM 1 Soft Seats; Option 1: With Internal Sensing, SST Pilot Filter Element, Pilot;Exhaust Tubed To Main Valve Outlet; Fluorocarbon Elastomer (FKM) Actuator Diaphragm With FEP Liners; 41.8" - 86.0" wc Pressure Range