#3 Drilled Rubber Stopper (DRS)


The #3 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper. The top diameter is 15/16", the bottom diameter is 3/4", and it has a 3/8" hole drilled in the center, the perfect size for an airlock.

The #3 rubber stopper is also available as a #3 solid rubber stopper (srs).