Made for Perception and Wilderness Systems brand sit-on-top kayaks, but can fit any scupper hole of the right diameter. Used to 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 of soft rubber-like material. Sold in pairs tied together with a bungee leash. The small end is 1”, large end is 1.5”. Made in USA.