5500 SERIES PILOT OPERATED PRESSURE/VACUUM VENT W/ PIPE AWAY ASME 150 FLANGE CONNECTION; 2" INLET SIZE; 2" OUTLET SIZE; CARBON STEEL BODY, 316 SST BOLT-IN SEAT RING; FEP-TFE ACTUATOR DIAPHRAGM, FFKM 1 PILOT SEAT, FEP PALLET DIAPHRAGMS; 12.1" - 18.0" WC PRESSURE SPRING RANGE; STANDARD: INTERNAL SENSING, SST PILOT - EXHAUST TO MAIN VALVE OUTLET;