55AK1DEH0000000000

5500 Series Rev D Pilot Operated Pressure Relief Vent With Pipe Away; Mates With ASME 150 Flange Connection; 4" Inlet Size; 6" Outlet Size; Aluminum Body And Bolt-In Seat Ring; EPDM Actuator Diaphragm, Pilot Seat, And Pallet Diaphragms; 3.2 - 15.0 PSIG Pressure Spring Range; Standard: Internal Sensing With Pilot Exhaust To Main Valve Outlet And Backflow Preventer