I’ve never seen a mechanical scupper device that really works well, to both let water out and keep water out of a boat. What keeps water out of the boat is the scuppers being above the waterline. Then just an open hole is a good enough scupper. There are many devices on the market, most will result in wet feet, in my experience.
Capt. Larry Teuton
Cracker Built Custom Boats
Marine Surveying & Repair
Nerf balls are the best.Hard to find?? went to Seels marine and found a plug.Screwed new plug to the one already on the boat.Had to silicone around it.New plug works great.Just remember to remove it so rain can flow out the scupper. Nancy at Seels will help you with the problem.She helped Me.