NEW STAINLESS STEEL LIQUID FILLED PRESSURE GAUGE WOG WATER OIL GAS 0 to 30 PSI LOWER MOUNT 0-30 PSI 1/4" NPT 2.5" FACE DIAL FOR COMPRESSOR HYDRAULIC AIR TANK 0-30 PSI LIQUID / GLYCERIN FILLED, 1/4" MALE NPT ( 1/4" NPT Measures 0.505" outside thread diameter in inches) LOWER / BOTTOM MOUNT CONNECTION, 2.5" DIAL / FACE, 304 STAINLESS STEEL CASE AND BEVEL BRASS INTERNALS AND CONNECTION, 1.5% DEGREE OF ACCURACY, PLASTIC LENS DUAL SCALE SHOWS BOTH PSI AND BAR, AMBIENT TEMPERATURE: MINIMUM -30deg F THROUGH 160deg F MAX