Item Type: Water Pump Pressure Switch Controller Material: Zinc Alloy Specification: 1.0~1.8kg/ 2.2-4lb(Suitable for 125W) Interface Thread Specification: 3/in Product Use: This switch is suitable for automatic cold and hot water self-priming booster pumps of major domestic and foreign brands and internal and external threaded elbows Package List 1 x Switch There are many reasons for nonstop, which are roughly classified as follows: damaged switch, poor sealing of check valve, pressure backflow, pressure leakage caused by pipeline water leakage, and insufficient pressure caused by wear of water pump impeller. 1The bottom of the switch is made of zinc alloy, while the cheap products on the market are made of plastic. 2The zinc alloy is durable, anticorrosion, and can withstand high pressure without water seepage or water leakage. 3The use of silver material doublecontact clutch, to ensure the strength of the switch, and the quality is stable and reliable. 4The doublecontact clutch has 15sided contact is more stable than singlepoint contact. 5Despite it's prolonged service life, it still can't be frequent switch on which may damage its function.