I have a manual pump I keep in my boat. It is about 30" long and weighs next to nothing. I have never had to use it, but I do know that in a situation where there is an electrical short on a boat, it is very possible that all electronics will be useless. Even if a boat has 2 motors and there is no common wiring, I have seen it several times where there is one wire that the owner is unaware of that causes both sides to be rendered useless.
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