This is an authentic OEM replacement part sourced directly from Rolair. The pressure switch is the device on your compressor that reacts to the pressure changes in your compressor tank, and it tells the pump in your compressor when to stop/start building pressure. This pressure switch cuts in a 105psi, and cuts back out at 135psi. This pressure switch is fitted with a manual on/of lever. There are multiple reasons your switch might need to be replaced, some signs are that the compressor will not stop when the desired pressure is reached, the compressor will not start when a pressure increase is needed, or if the switch is leaking air. There are many reasons the pressure switch could be leaking air, be sure to figure out where it is leaking from before replacing this part. Before you start any repairs on an air compressor unplug the machine, and make sure to drain the air out of the compressor tank.
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