5100 SERIES PILOT OPERATED PRESSURE/VACUUM VENT W/ VTA 6" INLET SIZE, MATES WITH STANDARD ASME 150# FLANGED CONNECTIONS; FLAT FACE ALUMINUM BODY, SST COVER, ALUMINUM SEAT RING; 18.1" - 36.0" WC PRESSURE SPRING RANGE; FLUOROCARBON ELASTOMER (FKM) ACTUATOR DIAPHRAGM, FLUOROCARBON ELASTOMER (FKM) PILOT SEAT AND PALLET DIAPHRAGMS; STD. WEIGHT LOADED 0.5 OZ/IN2 - 0.5 PSIG VACUUM RANGE; STANDARD: INTERNAL SENSING,SST PILOT - EXHAUST TO ATMOSPHERE WITH BACKFLOW PREVENTER; BIRD SCREEN (STD);