The Model PS-1 pressure switch is specifically designed for Wolos on-board systems, Models 800 and 840, and is compatible with a wide variety of other manufactures high-pressure air systems. The PS-1 switch is factory preset to turn on the compressor when tank pressure is below 80 psi. and will turn off the compressor when the tank pressure is 110 psi., with a tolerance of 10% (pressure turn on/off pressure range is not adjustable). Rated to operate reliably up to 3.5-amps and is built to be compact in size. Wires connect to switch using standard 1/4 in. push-on terminals.