5500 Series Rev C Pilot Operated Pressure Relief Vent With Pipe Away; 2" Inlet Size; 3" Outlet Size, Mates With Standard ASME 150# Flanged Connections; Raised Face Carbon Steel Body & Cover, SST Seat Ring; 2.1 - 12.0" Wc Pressure Spring Range; Fluorocarbon Elastomer (FKM) Actuator Diaphragm, Pilot Seals, And Seat; Standard: Internal Sensing,SST Pilot, Exhaust To Main Valve Outlet