This 142AP Pressure Gauge is used in applications such as air compressor stations and central control panels. The pressure gauge is 1-1/2 inch (38 mm) diameter and has a 1/8 inch NPT male-back connection for 1/4 inch (6 mm) OD tubing. This pneumatic pressure gauge has a dual 0 to 30 psi scale (0 to 200 kPa) English and metric scale and 2.5 percent accuracy for the middle half of the scale with 3.5 percent elsewhere.