... non combustible ga Differential pressure measurement gauge is widely used fan and blower pressures, filter resistance, wind speed, furnace pressure, orifice differential pressure, drum water ... 8female NPT hing and low pressure taps, duplicated, one pair side and one pair back.Accuracy: Plus or minus 4% of ... full scale, at 70 (21.1).Pressure Rating: 15PSI(1.03 ...