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 performance - Easy to install - Suitable for water heaters, water dispensers, water vending machines, and similar applications 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. - Due to differences in monitor displays, the image may not reflect the actual color of the item. Package includes: 1 x Water Flow Sensor