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Follow the manufacturer's adjustment setting located under the plastic cover of the switch if you want to lower or raise the pressure on the system. Most factory settings are common for most applications. Pressure switches are used on water pumps for the accurate control of the pump as it produces pressurized water. Without the use of the switch, the water pump would always be "on" or "off". However, with the pressure switch, the pump can be adjusted to turn "on" and "off" at predetermined settings to control the pump and subsequent pressure.