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145-175 PSI air compressor pressure switch or known as a pressure control valve. This switch has four ports on the bottom, one for the air inlet hookup, and the other three ports are usually used for a relief valve, gauges, or extra air outlets. These four ports are all 1/4" female NPT. This switch is also equipped with an on/off lever and an unloader valve on the side, which is 1/4" compression, if the unloader is not needed it does not need to be hooked up. For technical specifications please see below.