boat plug

boat plug

[′bōt ‚pləg]
(naval architecture)
A threaded plug that stops up the drainage hole of a boat near the keel and can be removed when the boat is dry-docked to drain out bilge water.
References in periodicals archive ?
If youre spending time on any body of water in South Dakota, make sure you pull your boat plugs upon exiting the lake or river and leave them out until your next launch.