I agree. However, a properly installed plug is not like a valve that can come loose. It can also save you a lot of grief in things spoiled by water accumulated during storage--especially wood, carpets, electricals, etc. The only time it is open is when the boat is out of the water and it is part of your prelaunch check list. I have recently seen two boats take significant damage from water accumulation. One of them had significant interior delamination and had to be scrapped. Water will seek out problems you did not know you had and make them worse.
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