#12 Drilled Rubber Stopper (DRS)


The #12 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper. The top diameter is 2.5625", the bottom diameter is 2.125", and it has a 3/8" hole drilled in the center, the perfect size for an airlock

The 12 rubber stopper is also available as a #12 Solid Rubber Stopper (SRS).