5500 SERIES PILOT OPERATED PRESSURE VENT W/ PIPE AWAY, 2" INLET SIZE; 2" OUTLET SIZE, MATES WITH STANDARD ASME 150# FLANGED CONNECTIONS; RAISED FACE CARBON STEEL BODY & COVER, SST SEAT RING; 12.1" - 18.0" WC PRESSURE SPRING RANGE; FEP-TFE ACTUATOR DIAPHRAGM, FFKM 1 PILOT SEALS & SEAT; STANDARD: INTERNAL SENSING,SST PILOT, EXHAUST TO MAIN VALVE OUTLET;