Feature: 1. The bottom is made of zinc alloy, which is durable, anti‑corrosion, withstands high pressure without water seepage, water leakage, etc. 2. Use silver material double contact, (the contact is 15‑sided contact point is more stable than the single round ), ensures the strength. 3. Large contacts for longer servicing life open on rising pressure, avoid frequent start of the switch. 4. Self priming, smooth, silent operation and can run dry without damage, stable and reliable. 5. Standard water pump replacement switch designed for use of electrically driven water pumps of most types. Specification: Item Type: Water Pump Switch Material: Zinc Alloy Specification: 2.2-3.0kg /4.8-6.6lb (Suitable for 550W 750W) Interface Thread Specification: 3/8in Usage: This switch is suitable for automatic cold and hot water self-priming booster pumps of major brands at home and abroad, for internal and external threaded bend. Package List: 1 x Water Pump Switch Note: The switch is suitable for automatic cold and hot water self‑priming booster pumps of major brands at home and abroad, for internal and external threaded elbow.