55A44DCC0000000000

5500 Series Rev D Pilot Operated Pressure Relief Vent With Pipe Away; ASME 150 Flange Connection; 4" Inlet Size; 4" Outlet Size; Aluminum Body, 316 SST Bolt-In Seat Ring; FFKM 1 Pilot Seat, FEP Pallet Diaphragm, FEP Actuator Diaphragm; 2.1" - 12.0" Wc Low Pressure Special Pilot;With Air Assist; Standard: Internal Sensing, Pilot Exhaust To Main Valve Outlet