3500 Series Pressure Vent With Pipe-Away; 2" Inlet Size; 2" Outlet Size, Mates With Standard ASME 150# Flanged Connections; Flat Face Derakane 470 Body & Cover,;W/Hast C. Studs, Derakane 470 Trim; Fluorocarbon Elastomer (Fkm) Pallet Diaphragm; Special Encapsulated Weight Option For Frp Body Material Only