Plug the scupper holes in your sit-on-top kayak. Prevents water from coming into the cockpit, but also prevents water from flowing out too. Easy to use, insert and remove. Made for Ocean Kayak brand boats, but can fit any scupper hole of the right diameter. Made of soft rubber-like material. Sold in pairs (07-1960-000, 07-1961-0000). The small end is 1 inch, large end is 1.5 inches.
See the OK SIZE CHART Size: SMALL , Color: YELLOW