Features: Made of high-quality brass material, environmental-friendly, really sturdy and durable to use. G1/2 type water flow sensor, its maximum water pressure is 1.75MPa, the range of flow is from 1L/min to 25L/min. Three wire connection: Red for positive pole, black for negative pole, yellow for pulse signal. The hall effect sensor is sealed- from the water pipe and allows the sensor to stay safe and dry. Lightweight, reasonable size, stable performance, low water pressure start-, easy to install, safe to use. Can be perfectly used for water heaters, water dispenser, water purifier, water vending machine, coffee maker, etc. Package Includes: 1X Water Flow Sensor Specifications: Material: brass Thread: G1/2 Working voltage: DC3.5~24V Inner /outer diameter: 13.7/20.3mm screw thread length: 16mm/10.5mm Wiring Red-In-Positive Yellow-Out-Signal output Black-GND-Negative Note: 1, in order to avoid particles, debris into the sensor, the sensor inlet must be installed at the filter 2, the installation of water flow sensor should be inside the equipment or indoors, do not be exposed to the outdoors or wet for a long for time The installation of the water flow sensor must avoid vibration and shaking environment and application in harsh environment such as high temperature So as not to affect the measurement accuracy of the sensor; 3. When magnetic materials or materials that produce magnetic force on the sensor are close to the sensor, its characteristics may occur Change; 4. Please do not disassemble the water flow sensor without authorization to prevent damage. The water flow sensor that has been disassembled without authorization is not available The scope of warranty-; 5, the structure of the sensor has not been used, for direct replacement may have discomfort, please put forward in for time note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.