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System Sensor WFD40 Water Flow Detector System Sensor WFD40 Water Flow Detector, 4" Pipe Size System Sensor WFD40 Waterflow Detector Also known as BK-WFD40 The System Sensor WFD40 is a water flow detector for use with 4" pipe. The System Sensor WFD series is compatible with schedule 10 to 40, 2" to 8" steel pipes and can be mounted in a vertical or..