Water Flow Switch, 1pc AC 220V 3A Plastic Magnetic Water Flow Switch Vertical/Horizontal Water Flow Control Sensor with G1/2" Description Water flow switch is a very important part in the instant water heater. When there is a certain water flow through inlet, electric circuits is connected and water heater begin to heat. When the water flow stops, the water heater stops working. Magnetic type water flow switch controls switching on and off through the magnet, which is safe and reliable. Features Design products adopting magnet repulsion instead of springs, safe and reliable.Permanent magnet filter removes impurities.Water is not easily scaling, which is conducive to health.Can be used a lot of times, long service life and good reliability.Used in the instantaneous electric water heater, can save electricity power.