95-125 PSI air compressor pressure switch or known as a pressure control valve that is used on many Hitachi, and Emlgo compressors. This switch has four ports on the bottom for air inlet hook up, which are 1/4" female NPT. This switch is also equipped with an on and off push/pull style button and an unloader valve which is 1/4" compression. For technical specifications please see below. Specifications: Pressure Rating: 95 - 125 PSI Port Configuration: 4 Ports 1/4" NPT Unloader Size: 1/4" Compression Equipped with a Manual On and Off Push/Pull Style Pressure Setting is Adjustable Max Amp Rating on 230 Volts: 20 Amps If you have a larger industrial compressor with a magnetic starter, the amps do not matter. All the switch is doing is telling the starter when to turn on and shut off.