3400 SERIES PRESSURE VENT STANDARD PALLET DESIGN; 12" INLET SIZE, MATES WITH STANDARD ASME 150# FLANGED CONNECTION; RAISED FACE CARBON STEEL BODY, SST TRIM, CARBON STEEL WEATHERHOOD; FEP-TFE PALLET DIAPHRAGM; STANDARD WEIGHT MATERIAL STEEL OR COMBINATION OF STEEL AND SST;