Square D 9013FHG59J52M1X Pumptrol Air-Compressor Pressure Switch, 125 PSIThe Square D Pumptrol air compressor pressure switch controls an electrically driven air compressor in a power circuit when the adjustable threshold upon falling is reached and is set to turn off at 125 PSI. Switch has a 1 4" NPT external fluid connection & is suitable for use with a higher horsepower motor with 2 HP or greater. The non adjustable differential is 40 PSI, and the adjustable cut out range is 100 PSI to 200 PSI. Pressure sensor size: 200