Descriptions:1.Suitable for 8mm inner diameter hose.2.Water Flow Switch adopts a Magnetic Reed Switch and a movable magnet which is fixed inside the water pipe. When water flows in the pipe, the magnet will detect the water flow and make the reed switch close or open.3.Mainly used for water heater, boiler, coffee machines, hot card machines, steam equipment, water system, selling self-help water systems, water treatment equipment, cooling systems, mechanical equipment, instrumentation. Specifications:Product Name: Water Flow SensorMaterial: Brass(Shell)Liquid Temperature: Not More Than 60CFlow Range: 1.2-12L/minConnector Size: 8mmMax Switch Voltage: DC250VMax Contact Rating: 70WMax Current: 0.3AMaximum Water Pressure: 1.