Top Quality Material Made of high quality, eco-friendly copper material, really sturdy and durable to use. Three-wire connection G1 / 2 type water flow sensor, its maximum water pressure is 1.75 MPa, the 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 at each turn. The Hall effect sensor is sealed from the water hose and allows the sensor to stay dry and secure. Easy to install Lightweight, reasonable size, stable performance, low water pressure start, easy to install, safe to use. Widely Application Can be perfectly used for water heater, water dispenser, water purifier, water dispenser, coffee maker, device. Product Features: Condition: 100% brand new Material: Copper Color: Shown as image Type: G1 / 2 \ (Outer Thread Diameter), DN20mm Water quality requirement: 60 Start the flow range: 1.5L / min Flow rate: 1-30L / min Maximum water pressure: 1.75MPa Working voltage range: DC4.5-18V Max current: 10mA Insulation resistance: 003rd 100M Electrical resistance: AC500V, 50Hz Copper switch length: Approx. 60mm / 2.4inch Thread length: Approx. 35cm / 13.8inch Weight: Approx. 95g Packaging included: 1 x water flow switch