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Message: <blockquote data-quote="Mad Dog 2" data-source="post: 523594" data-attributes="member: 35614">I would go with a real bilge pump with a float switch and mounted it on a piece of plastic which will protect and isolate  the aluminum.The sensing bilge pump’s some require the pump to cycle on and off to check the bilge. I worked for a marine contractor our work boat sensing bilge pump over time would kill the battery. Not very convenient.Aluminum boats are great, have a lot of benefits and can have a very long life.Be careful of using paints with copper, zinc or other paints that react with aluminum. Also be careful of bronze and various materials also fasteners  that react with aluminum especially copper in a salt water environment. I have recently heard of problems with pressure treated lumber in contact with aluminum being used as bunk supports?</blockquote>