HydroActive Adjustable Pressure Switch Electric Electronic Automatic Water Pump ControllerThe automatic water pump controller automatizes the starting and stopping operations of water pump with regard to a stop in pressure (opening of the taps) and to stopping of the flow through the system (closing the taps), respectively. It ensures the constant pressure of water while you're using the tap. The controller will stop the pump from running when there is a loss of water supply which prevents the pump from running dry and causing damage.