Premium MaterialMade 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 SensorThere is a built-in hall effect sensor that outputs an electric pulse every turn . The hall sensor is sealed from the water pipe and keeps the sensor dry and safe. Easy InstallationLightweight, reasonable size, stable performance, low water pressure start , easy to install, safe to use. Widely ApplicationCan be perfectly used for water heaters, water dispenser, water purifier, water dispenser, coffee maker, appliances. Product Features: Condition: 100% Brand New Material: Copper Color: Shown as picture Type: G1/2" (Thread outer diameter), DN20mm Water quality requirement: 60 Start the flow range: 1.5L/min Flow range: 1-30L/min Maximum water pressure: 1.75MPa Voltage range working: DC4.5-18V Max current: 10mA Insulation resistance: 003rd 100M Electrical resistance: AC500V, 50Hz Copper Switch Length: Approx.60mm/2.4inc h Wire Length: Approx. 32cm Weight: Approx. 95g Package Included: 1 x Water Flow Switch