CARBO Instruments 4" Pressure Gauge, Stainless Steel Case, Liquid Filled, 0-4000 psi/kPa, Lower Mount 1/4" 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