3500 Series Pressure Vent With Pipe-Away; 2" Inlet Size; 3" Outlet Size, Mates With Standard ASME 150# Flanged Connections; Flat Face Derakane 470 Body & Cover, W/SST Studs, Derakane 470 Trim; Fep-Tfe Pallet Diaphragm; Standard Weight Material Steel Or Combination Of Steel And SST