D7963 Compound Gauge Gauge Type Liquid Filled Dial Size (In.) 2-1/2 Range 30 Hg Vac to 150 psi Dial Size (mm) 63 Connection Size 1/4 NPT Connection Location Lower Smallest Graduation (PSI) 2 Smallest Graduation (In. Hg) 5 Graduations 20 psi Accuracy (%) +/-1 Case Material Zytel Nylon Case Color Black Socket Material Brass and Buna-N Tube Material Copper Alloy Filled With Glycerin Lens Material Polycarbonate Removable Ring Material Twist On Zytel Nylon