Air compressor Manometer Pressure Gauge 1.Steel case,ABS case,SS case ... SS connection 4.Glycerine fil Air compressor pressure gauge are used in Air Compressors,Hollow Pumps,Air-Pressure Piping,Pressure Regulating Valves,Testing Equipment,Medical ... ) / 4" (100mm) / 6" (150mm)3. Pressure Range: vacuum, compound, 0 - 15psi - 10,000psi (customer-made pressure range)4. Connection: Bottom (Vertical), Center ...