1/4" NPT Water Flow Switch PE Tube Liquid Flow Sensor Switch for Water dispenser and water purifier 1. Introduction: The state of the liquid flowing or still in the pipeline is output in the form of an electric switch signal. 2. Interface size: 1/4 NPT. 3. The switch contact carries the maximum current: 100mA 4. The switch contact carries the maximum voltage: DC100V 5. Tips for replacing the filter element of self-priming pure water machine and water purifier in areas without running water Package included: 1 * Flow Switch