【Premium Material】Made of high quality copper material, environmentally friendly, really sturdy and durable to use. 【Three-Wire Connection】G1/2 type water flow sensor, its maximum water pressure is 1.75MPa, the flow range is from 1L/min to 30L/min. Three-wire connection: red for positive pole, black for negative pole, yellow for pulse signal. 【With Hall Sensor】There is a built-in Hall sensor that outputs an electrical pulse at each revolution. The Hall effect sensor is sealed from the water pipe and allows the sensor to stay dry and safe. 【Easy Installation】Lightweight, reasonable size, stable performance, low start water pressure, easy to install, safe to use. 【Widely Application】Can be perfectly used for water heaters, water dispensers, water purifiers, water dispensers, coffee makers, and other devices. Product Description 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 Rate Range: 1-30L/min Max Water Pressure: 1.75MPa Working Voltage Range: DC4.5-18V Max Current: 10mA Insulation Resistance: 003e 100MΩ Electrical Resistance: AC500V, 50Hz Copper Switch Length: Approx. 60mm/2.4inch Wire Length: Approx. 32cm Weight: Approx. 95g Package Included: 1 x Water Flow Switch