Premium MaterialMade of high quality copper materials, eco-friendly, really sturdy and durable to use. Three Wire Connection G1/2 type water flow sensor, its maximum water pressure is 1.75MPa, flow 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 emits an electrical pulse with each revolution. The Hall effect sensor is sealed from the water pipe and keeps the sensor dry and safe. Easy SetupLightweight, reasonable size, stable performance, low water pressure start, easy to install, safe to use. Widely ApplicationCan be perfectly used for Water Heater, Water Dispenser, Water Purifier, Water Dispenser, Coffee Maker, Appliance. Features: Condition : 100% brand new Material: Copper Color: Shown as picture Type: G1/2"(Thread outer diameter), DN20mm Water quality requirement: 60 Start flow range: 1.5L/min Flow range: 1-30L/min Maximum water pressure: 1.75MPa Working voltage range: DC4.5 -18V Max current: 10mA Insulation resistance: 003e 100M Electrical resistance: AC500V, 50Hz Copper switch length: Approx 60mm / 2.4inch Wire length: Approx 35cm / 13.8inch Weight: Approx 95g Package Included: 1 x Water Flow Switch