【Premium Material】Made of high quality copper material, eco-friendly, really sturdy and durable to use. 【Three Wire Connection】 Water Flow Sensor G1/2 type, its maximum water pressure is 1.75MPa, the flow rate range is 1L/min to 30L/min. Three-wire connection: red for positive pole, black for negative pole, yellow for pulse signal. 【With Hall Effect Sensor】There is a built-in hall effect sensor that outputs an electrical pulse every turn . The hall sensor is sealed from the water pipe and keeps the sensor dry and safe. 【Easy Installation】Lightweight, reasonable size, stable performance, low water pressure start , easy to install, safe to use. 【Widely Application】Can be perfectly used for water heaters, water dispenser, water purifier, water dispenser, coffee maker, appliances. Number of sends:1 pcs