Item Type: Water pressure switch Rated Voltage: 220V Rated Current: 16A Male Thread Diameter: Approx.12.5mm / 0.5inG1/4 Size: Approx.50 x 50mm / 2 x 2 in Pressure Range(Optional): 1.0-1.8KG (fit for 125W) 1.5-2.2KG (fit for 250W / 300W / 371W) 1.8-2.6KG (fit for 50W) 2.2-3.0KG (fit for 750W) Package List 1 x Water Pressure Switch 1 Bag of Accessories Forexample(1.5& 8209;2.2KG)technicalexplanation:whenthewaterpressureis1.5KG,thewaterpumpwillstartautomatically,andthe2.2KGpressuretypewaterpumpwillstopworking. 1The contact point of water pressure switch is silverplated with highgrade pure copper conductive sheet, with good response effect. 2How to adjust the water pressure: cut off the power firstly. Tear down the plastic cover, press "+" to Increase pressure (anticlockwise), press "" to reduce pressure (clockwise). 3With highquality insulating material, the water pressure controller is durable and high temperature resistant, its cuicuit not easily get damaged. 4You can choose right water pressure switch according different power requiremet and the male thread diameter. 5The water pressure control switch could automatically maintain a constant pressure in the pipeline as well as a constant water flow.