#11 Drilled Rubber Stopper (DRS)


The #11 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper. The top diameter is 2 1/4", the bottom diameter is 1 15/16", and it has a 3/8" hole drilled in the center, the perfect size for an airlock

This stopper is also available as a #11 solid rubber stopper (srs).