#5.5 Drilled Rubber Stopper (DRS)


The #5.5 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper. The top diameter is 1 1/8", the bottom diameter is 1", and it has a 3/8" hole drilled in the center, the perfect size for an airlock.

The #5.5 rubber stopper is also available as a #5.5 solid rubber stopper (srs).