Scupper plugs are to put in the small holes that are a little smaller than the diameter of a ping pong ball that are in the cockpit and tankwell of the kayak so water won't splash up thru them. Most kayaks have 4 scupper holes in the cockpit, and 2 in the tankwell. I don't usually use mine because I get very little water that comes up thru them. They are also designed that if you get a lot of water that comes over the hull like a big wave you want the plugs out because the scupper holes will allow the excess water to drain out, so you don't swamp your vessel.
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