Features 1、The bottom of the switch is made of zinc alloy, while the cheap products on the market are made of plastic. 2、The zinc alloy is durable, anti‑corrosion, and can withstand high pressure without water seepage or water leakage. 3、The use of silver material double‑contact clutch, to ensure the strength of the switch, and the quality is stable and reliable. 4、The double‑contact clutch has 15‑sided contact is more stable than single‑point contact. 5、Despite it's prolonged service life, it still can't be frequent switch on which may damage its function. Specification 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