Preset on pressure: 40 psi/ the contacts close at this pressure to send power to the motor/ pump. Preset off pressure: 60 psi/ the contacts open at this pressure to shut power off to the motor/ pump. Adjustable pressure: Instructions are under the lid of the pressure switch on how to adjust pressure. Max pressure: 80 psi Min pressure: 20 psi Can be wired 1 phase or 3 phase 15 or 230 volt / at 115 volt 1 phase it will handle 1.5 hp, at 230 volt 1 phase it will handle 2 hp, And at 230 volt 3 phase it will handle 3 hp. Color: Gray Material: Metal Quantity: 4 PC Package Included: 4 x Water Pump Pressure Control Switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.