Features: Light and flexible appearance, small size, easy to install.impeller is inlaid with a stainless steel shaft and is for always wear-resistant. The seal ring used on the structure under the force will never- leak,Hall elements imported, water-proof design to prevent water. for DC 3.5V-24V / Pulse characteristics ( 8xQ-4)5%, F-frequency, Q-flow- per liter/minute. Water pressure resistance : More than 1.75MPa working voltage range DC3.5 ~ 24V. Can be perfectly used for water heaters, water dispenser, water purifier, water vending machine. Specifications: Material: brass + stainless steel Size: approx 5.8x3.8cm/2.3x1.5in Thread: 1-inch Thread length: 13mm Voltage: for DC 3.5-24V Water pressure resistance : More than 1.75MPa 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. Package includes: 1x Water Flow Switch