Our stoppers or plugs are made from flexible, red synthetic rubber. They are designed to fit 1" diameter round openings no more than 1/8" thick. The height of the plug from top to bottom is 3/8". For the best fit, measure the diameter of your opening to the nearest 1/16 of an inch. A US company in business since 1949, National Artcraft is a name you can trust.

National Artcraft's flexible, red synthetic stopper is designed to fit a 1" diameter round openings. Please measure carefully. See the image in our photos for measuring guidelines. The groove on the side will accommodate material that is no more than 1/8" thick. The height of the plug from top to bottom is 3/8".