Model 1049 Rev A Pilot Operated Vent Valve; Carbon Steel Body; 6" Inlet X 8" Outlet Mates With ASME 150 Flanged End Connections; Buna-N Soft Seats; Standard Configuration With Internal Sensing And Pilot Exhaust To Atmosphere; BUNA-N Actuator Diaphragm; 3.2 - 14.0 psi Pressure Range