Features: Good sealing effect, easy to install. Make of brass, durable, anti corrosion, high temperature resistant. Mainly used for water flow switchs control of electric appliances such as water heaters, humidifiers, drinking fountains. When this product connect to a load 50W, intermediate must be added, otherwise it cannot be used. Working method: When there water flow in the water flow switchs and the water flow rate ≥1.5L/min, the magnetic in the water flow switchs will receive water. The flow pushes the displacement, and the magnetic displacement drive the magnetic source to produces the magnetic control effect, so that the water flow switchs output "on" Signal. The signal input to the equipment control system, and the control system realizes the control function. When the water flow less than the starting flow, the water flow switchs outputs a "off" signal. The control system produces the samereverse control. Specifications: Material: Brass Thread: DN20 Inner Diameter: 18mm, Outer Diameter: 26mm Thread: 15mm Switching current: 0.5A Load current: 0.5A Contact resistance: 100mg Load power: 50W Load voltage: 220VDC Minimum breakdown voltage: 220VDC Starting water flow: ≤1.5L/MIN Working water flow range: 1.5-50L/MIN Starting water pressure: ≤0.1Mpa Withstanding water pressure: ≤1.75Mpa Operating temperature: 1~120℃ Applicable temperature: -20~150℃ Response time: 0.2S Release time: 0.2S Size: Approx. 6.2x3.3x3cm/2.44x1.30x1.18in Package Includes: 1x Fluidmeter Counter note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.