5500 Series Rev D Pilot Operated Pressure Relief Vent With Pipe Away; Mates With ASME 150 Flange Connection; 2" Inlet Size; 3" Outlet Size; 316 Stainless Steel Body And Bolt-In Seat Ring; Fluorocarbon Elastomer (FKM) Actuator Diaphragm, Pilot Seat, And Pallet Diaphragm; 18.1" - 36.0" wc Pressure Spring Range; Opt-7: Internal Sensing With Pilot Exaust To Atmosphere With Rotomoter To Purge Pilot Sense Line And Flame Screen