You know what it looks like… but what is it called?
TAKE THE QUIZbilge plug
noun
: boat plug
If your boat has a bilge plug, remove the plug when the boat is out of the water so that any water that has accumulated in the bilge can drain free.—
Twain Braden, The Handbook of Sailing Techniques, 2003
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Merriam-Webster unabridged
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