Features 1、This water pump pressure switch controller can withstand high pressure without water seepage, water leakage and other problems. 2、The bottom of the switch is made of zinc alloy, which is durable and corrosion‑resistant. 3、This switch is suitable for most self‑priming booster pumps, suitable for 550W and 750W water pumps. 4、It adopts silver material double contact clutch, ( the contact is 15 sided contact point is more stable than single point contact ). 5、The double contact clutch can ensure the strength of the switch, and the quality is more stable and reliable. Specification Item Type: Water Pump Pressure Switch Material: Zinc Alloy Specification: 2.2~3.0bar ( Suitable for 550W / 750W ) Interface Thread Specification: Double 3/8NPT Inner Wire Product Use: Automatic Cold And Hot Water Self Priming Booster Pumps Of Major Domestic And foreign Brands, for Female And Male Threaded Elbows. (for HY, for Well, for LG, for Walrus, for Hanjin, for SUPR^SUNY, for SHIMGE, for LEO, for ESE, for SNOW-MOTER, for Xinxishan) Package List 1 x Water Pump Pressure Switch