5500 Series Rev D Pilot Operated Pressure Relief Vent With Pipe Away; ASME 150 Flange Connection; 2" Inlet Size; 2" Outlet Size; 316 SST Body, 316 SST Bolt-In Seat Ring; FFKM 1 Pilot Seat, FEP Pallet Diaphragm, FEP Actuator Diaphragm; 12.1" - 18.0" Wc Pressure Spring Range; Standard: Internal Sensing, Pilot Exhaust To Main Valve Outlet