Features: Working range: 1-30L/min, water pressure: 1.75MPa. Made of brass, all materials comply with ROHS testing standards. Wiring: Red - positive input, Yellow - signal output, Black - negative ground. Waterproof, heat resistant, pressure resistant, cold resistant, compact size, stable and reliable. Easy to install. Suitable for water heaters, water dispensers, water vending machines, etc. Specifications: Material: Brass Size: Approx 5 x 3.5 x 3cm / 2 x 1.4 x 1.2 inches Thread: G3/4 Working voltage: DC 3.5-24V Inner/outer diameter: 17.9/26mm Note: Please allow 1-3cm error due to manual measurement. Please ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the image may not reflect the actual color of the item. Package includes: 1 x Water Flow Sensor