CARBO Instruments 1.5" Pressure Gauge, Stainless Steel Case, Liquid Filled, Vacuum -30Hg/+160psi Compound, Lower Mount 1/8" NPT Reliable and dampen Pulsation & Vibration Oil, Water, Air, Compressor, Hydraulics, HVAC, Gaseous & Liquid media that are not highly viscous or crystallizing and not corrosive or oxidizing to copper alloy parts