High quality materials Made of high quality copper, environmentally friendly, very sturdy and durable to use. Lightweight, reasonable size, stable performance, low water pressure start, easy to install, safe to use. G1 / 2 "water flow sensor Its maximum water pressure is 1 , 75 MPa, 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. < br> Hall effect sensor There is a built-in Hall effect sensor which emits an electric pulse with every turn. The Hall effect sensor is waterproof to the water pipe and keeps the sensor safe and dry. < br> Wide range of applications Can be perfectly used for water heater, water dispenser, water purifier, automatic water dispenser, coffee maker, flow meter, water control machine 'water, etc. Our water flow sensor, it is a kind of G1 / 2 "type water flow sensor, its maximum water pressure is 1.75 MPa and the flow range is 1L / min. at 30L / min. It can be perfectly used for water heater, water dispenser, water purifier, water dispenser, coffee maker, flow meter, water control machine and so on. Features: Condition: 100% brand new Material: copper Color: shown as picture Type: G1 / 2 "(External thread diameter), DN20mm Water quality requirement: 60 Starting range: 1.5 L / min Flow range: 1-30L / min Maximum water pressure: 1.75MPa Working voltage range: DC4.5-18V < / p> Max current: 10mA Insulation resistance:> 100M Electric strength: AC500V, 50Hz Length of copper switch: Approx. 60mm / 2.4inch Wire Length: Approx. 35cm / 13.8inch Weight: Approx. 95g Package Included: < p> 1 x water flow switch