... is a problem.Dial size: 2", 2.5", 4", 6"Pressure range:-30" Hg-0-15,000PSISocket:316SS bottom and back connectionConnection thread ... Safety glass availableDial plate:Single and dual scale (psi, kpa, mpa, bar, kg/cm2) availableAccuracy:ASME B40.1 Grade B (3 ... -clamp5) Lower back connection with U-clamp Welded Case oil pressure gauge