Wide Application - Also great for boat repairs filling old holes. Fill Holes and Stop Leaks Caused by Broken Hoses, Valves, Seacocks and Thru Hulls. Durable Material: They are made of high-quality wood material tapered softwood, after installation, it absorbs water and expands to conform to the irregular and unpredictable shapes of a hull breach. Easy To Use: Simple Design. This ensures against dislodging until a more permanent repair can be made. Emergency Plug: Wood Plugs are used for emergency repairs of leaks due to broken hoses, valves, etc. Package Content: Marine City Boat Tapered Conical Soft Wood Plugs include 3 different sizes 9 Soft Wood Plugs.