#13 Drilled Rubber Stopper (DRS)


The #13 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper. The top diameter is 2 11/16", the bottom diameter is 2 5/16", and it has a 3/8" hole drilled in the center, the perfect size for an airlock

The #13 rubber stopper also comes as a #13 Solid Rubber Stopper (srs).