National Artcraft's plug or stopper is made from flexible, red synthetic rubber. This plug is designed to fit a 3/8" diameter round opening and no more than 1/8" thick. The overall height of the plug is 3/8". For the best fit, measure your opening to the nearest 1/16 of an inch. In business since 1949, National Artcraft is a name you can trust.

National Artcraft's flexible red synthetic stopper is designed to fit 3/8" diameter openings.  Please measure carefully and see the image guide for correct hole size measuring. The groove on the side will accommodate material that is no more than 1/8" thick. The overall height of the plug is 3/8".