Johnson Pump Bilge Alert High Water Alarm - 12V Ultima [72303-001]Bilge Alert High Water Alarm 12V Ultima High water alarm featuring digital technology using the patented Mires field effect. Totally sealed fluid detectors are never in contact with water, will not corrode, and are not affected by oil or debris. Bilge Alert detects water and sends a signal (3 seconds delay) to the alarm and switch conveniently mounted on a panel. A three way rocker switch allows the switch to be tested, turned off, and armed.