Join Date: Oct 2011
Location: Jamestown, RI
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Apparatus for moving rain water in to boat with vent feature
That's a cabin vent. The thing you push up from the inside opens a damper to allow air to flow out of the vent. You would close the damper to prevent rain or sea water from coming in. I think it probably shouldn't be sealed around the outside edge. This would allow the rainwater to drain out when the damper is closed.