Feature: 1. This water flow sensor is made of brass, owning stable operation, high temperature resistance, and low water pressure start 2. Wide range of applications, can be used in water heaters, credit card machines, water vending machines, flow measurement equipment 3. The water flow sensor is light in weight, flexible in outline, small in size and easy to install. The interface size is G1/2in inner and outer wire 4. This water flow sensor is waterproof, heat resistance, pressure resistance and cold resistance, owning good operation performance 5. The flowmeter is light and handy, easy to install. The connection is firm, the sealing performance is good and the problem of water leakage is avoided. Specification: Item Type: Water Flow SensorMaterial: Brass Model: YF-B20 Interface Size: G1/2in female male thread Flow Range: 0.3-10L/min Pulse Characteristics: F=11 x Q Interface Mode: One end has 4 points of male thread that is approx. 20mm / 0.8in, G1/2, one end has 4 points of female thread Wiring Mode: Red positive signal, black negative, yellow signal output. Package List: 1 x Water Flow Sensor