Features: Good sealing effect, easy to install. Made of brass, durable, corrosion-resistant, high temperature resistant. Mainly used for water flow switches for controlling electrical appliances such as water heaters, humidifiers, and drinking fountains. When this product is connected to a load of 50W, an intermediate part must be added, otherwise it cannot be used. Working method: When there is water flow in the water flow switch and the water flow rate is ≥1.5L/min, the magnet in the water flow switch will receive water. The flow pushes the displacement, and the magnetic displacement drives the magnetic source to produce the magnetic steering effect, so that the water flow switch outputs an \"on\" signal. The signal is input to the equipment's control system, and the control system realizes the control function. When the water flow is less than the starting flow, the water flow switch outputs an \"off\" signal. The control system produces the same reverse 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 Withstand 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 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. Package includes: 1x Liquid Flow Meter