55B21DCL0000000000

5500 Series Rev D Pilot Operated Pressure Relief Vent With Pipe Away; Mates With PN16 Flange Connection; 2" Inlet Size; 2" Outlet Size; Aluminum Body And Bolt-In Seat Ring; FFKM 1 Pilot Seat With FEP Pallet And Actuator Diaphragms; 1.2" - 2.0" wc Low Pressure Pressure Spring Range With Air Assist; Standard: Internal Sensing With Pilot Exhaust To Main Valve Outlet And Backflow Preventer