This 60 psi hydraulic air compressor pressure gauge features 2" front and 1/4" NPT side mount. This pressure gauge can be used to measure air, water, oil, gas and any other element that brass does not corrode. It also can be a perfect pressure gauge for swimming pool filters. This pressure gauge features dual scale design and clear number for easy and convenient reading. The case is made of metal. Provides good protection of the internal part, durable resistance to high temperature, shock and corrosion. Easy to use: bottom mount, no additional tools required, easy installation.