Features: Working voltage range: DC5-18V. All brass casting structure, precise and reliable. Mechanical no power consumption, steady water flow. Wear-resistant, anti-corrosion and high temperature resistance. Suitable for water heater, water dispenser, etc. Specifications: Material: brass Thread: 1/2in Operating Voltage Range: DC5-18V Inner /outer diameter: 15/20.7mm Water pressure: ≤ 1.75mpa Output pulse high level: DC4.7V (input voltage DC5V) Output pulse duty cycle: 50%±10% Insulation resistance: more than 100M ω Flow range: 1-25L/Min±3% Sealing: seal each hole, add 1.7mpa under water pressure test for 1 minute without leakage phenomenon Package Includes: 1x Flow Switch 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.