An open mast hole fills quickly with water, debris and critters, even with a cover over the boat. Eventually this muck will eat through the walls of the hole, resulting in leaks. There are not many options available for plugs.
Our tight-fitting plug comes with a custom seal to keep water and debris out. Easily removes when it is time for sailing. The plug floats, too - in case it goes overboard.
Plug fits 2.5" mast hole of Sunfish, Laser and similar boats. Other sizes available upon request. Custom seal is made of soft Neoprene rubber, ideal for outdoor applications.