Feature: 1. The bottom of the switch is made of zinc alloy, which is different from plastic products. Durable and corrosion‑resistant. 2. This automatic water pump pressure switch can withstand high pressure without water seepage or water leakage, which is very practical. 3. Silver material double contact clutch(the contact is 15‑sided contact is more stable than single point ), to ensure the strength of the switch, stable and reliable. 4. This automatic water pressure switch has a long service life, and if you avoid frequent starting it，you can use it for a long time. 5. Suitable for automatic cold and hot water self priming switch pumps of major brands, and for internal and external threaded elbow pipes. Specification: Item Type: Water Pump Pressure Switch Material: Zinc Alloy Specification: 1.8~2.6bar (Suitable for 550W) Interface Thread Specification: Double 3/8NPT Inner Wire Product Use: Suitable for Automatic Cold and Hot Water Self Priming Switch Pumps of Major Domestic and Foreign Brands, and for Internal and External Threaded Elbows. (for HY, for Well, for LG pump, for WALRUS, for Hanjin Pump, for Supr^Suny, for SHIMGE, for Leo Pump, for ESE, for Shaoxing Snow, for Shanghai Xinxishang, etc.) . Package List: 1 x Switch Note: This switch is suitable for automatic cold and hot water self‑priming switch pumps of major domestic and foreign brands, and for internal and external threaded elbow pipes.