55B45DCC0000000000

5500 Series Rev D Pilot Operated Pressure Relief Vent With Pipe Away; Mates With PN16 Flange Connection; 4" Inlet Size; 4" Outlet Size; Carbon Steel Body, 316 Stainless Steel Bolt-In Seat Ring; FFKM 1 Pilot Seat With FEP Pallet And Actuator Diaphragms; 2.1" - 12.0" wc Pressure Spring Range With Air Assist; Standard: Internal Sensing With Pilot Exhaust To Main Valve Outlet And Backflow Preventer