Yak Gear Scupper Plug Kit 4pc. Scupper plugs act as sealant to the self-bailing scupper holes to keep extra water out of the cockpit of your sit-on-top kayak. These plugs fit any scupper hole with a circumference ranging from 3/4" to 1-1/2". Includes 4 plugs. Package Contents: Yak Gear Scupper Plug Kit The Yak Gear Scupper Plug Kit is a quality addition to the Yak Gear lineup. For more great deals on Water Sports Equipment by Yak Gear please browse our Yak Gear Sports Equipment page.