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Both the Montauk and Outrage 18 are self bailing not self draining.

Each boat will have some water in the bilge area. Any additional water will drain out. It is the same concept as a toilet. Add additional water and the level in the bowl will return to the original level.

There are no Boston Whaler models that I know of that are completely dry.

I would leave a 13, 15, Montauk, Outrage 18 or Montauk 150 or 170 on a mooring or dock without a plug.