Johnson Pump Bilge Alert High Water Alarm - 12V Sensor [72303]Bilge Alert High Water Alarm 12V Sensor The Johnson Bilge Alert High Water Alarm detects disruptions in a bilge pump from water or other fluids. The alarm is very small, easy to mount, and is held within a sealed case that resists all corrosion or potential damage from oil and debris. The Johnson Bilge Pump Alert system utilizes a patented Mirus field effect detector cell that produces a micro electrical field. When activated, the system triggers a