Features:Working range: 1-30L/min, water pressure: 1.75mpa.Made of brass, all materials are in line- with ROHS- testing standards.Wiring: Red-In for posotive, Yellow-out for signal output, Black-GND for negative.Waterproof, heat resistance-, pressurresistance, cold resistance-, small size, stable and reliable. Easy to install.Suitable for water heater, water dispenser, water vending machine, etc. Package Includes:1x Water Flow Sensor Specifications:Material: brass- Size: approx 5x3.5x3cm/2x1.4x1.2-inchThread: G3/4Working voltage: DC3.5-24VInner/outer diameter: 17.9/26mm note:Please allow 1-3cm error due to manual measurement. please 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.