The working of the water is different, some are well water, some are tap water, and the pressure in the water pipe itself is different, so you need to adjust the (please cut off the power when adjusting). Remove the screw on the cover. Increase the pressure to the "+" to fine-tune, and to lower the pressure to the "-" to fine-tune. The pressure is suitable for cold and hot water automatic self-priming pumps, pumps, garden pumps, water pumps and other water pumps. It can automatically turn on and off the water pumps according to the changes in the pressure in the pipeline to achieve unmanned control. The operating cylinder has stable and for The machine saves power consumption. Pressure : 1.0-1.8KG (suitable for 125W), 1.5-2.2KG (suitable for 250W 300W 371W). : 110V/230V; current: /5A. The use of silver double to the applicable strength of the , stable and , and long service life., Manufacturer: Wayfadacc