【Easy to Use】Lightweight, reasonable size, stable performance, low water pressure start, easy to install, safe to use. 【High Quality】Water switch made of high-quality copper material, environmental-friendly, really sturdy and durable to use, its maximum water pressure is 1.75MPa, the range of is from 2L/min to 45L/min. 【Hall Effect Sensor】There is an integrated hall effect sensor that outputs an electrical pulse with every revolution. The hall effect sensor is sealed from the water pipe and allows the sensor to stay safe and dry. 【Three wire connection】Red for positive pole, black for negative pole, yellow for pulse signal. 【Widely Use】Can be perfectly used for water heaters, water dispenser, water purifier, water vending machine, coffee maker, measurement device, water control machine and so on., Manufacturer: Zerodis