Item Type: Water pressure switch_x000D_Rated Voltage: 220V_x000D_Rated Current: 16A_x000D_Male Thread Diameter: Approx.12.5mm / 0.5inG1/4_x000D_Size: Approx.50 x 50mm / 2 x 2 in_x000D_Pressure Range(Optional): 1.0-1.8KG (fit for 125W)_x000D_ 1.5-2.2KG (fit for 250W / 300W / 371W)_x000D_ 1.8-2.6KG (fit for 50W)_x000D_ 2.2-3.0KG (fit for 750W) 1The contact point of water pressure switch is silver?plated with high?grade 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 high?quality 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.1 x Water Pressure Switch1 Bag of AccessoriesFor example (1.5?2.2KG) technical explanation: when the water pressure is 1.5KG, the water pump will start automatically, and the 2.2KG pressure type water pump will stop working.