Brand new 95-125 PSI air compressor pressure switch or known as a pressure control valve. This switch has four ports on the bottom, one for air inlet hook up 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 a on and off lever and a unloader valve on the side, which is 1/4" compression, if the unloader is not needed it does not need to be hooked up.