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Rule model 40 Rule-A-Matic Plus Switch is a Mercury free switch that is designed to automatically turn on your bilge pump once water in your boats bilge reaches the switch.
This float switch has a strong, fully integrated, impact resistant cover, which protects against debris and jamming. 14 gauge marine grade wires exit out on the top to keep them out of the water. Dual level anti-clog water slots. Switch has manual testing feature for system trouble shooting and testing. Use with pumps up to 20 amps. Available with or without a built-in fuse holder.
June 5, 2015
Used two in my sloop. Both worked for about 1 season, and then both failed. Continuously delivered power to the pumps, and would not shut off -- even if manually held in off position. I cut one of the "waterproof" switch units open, and found it was full of water. You'll do better with a mercury switch thoroughly packed with urethane for waterproofing.
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