#3 Drilled Rubber Stopper (DRS)
Our #3 Drilled Rubber Stopper (DRS) is a pure laboratory stopper. The top diameter measures 15/16", the bottom diameter measures 3/4", and has a 3/8" hole drilled in the center, the perfect size for an airlock.
This #3 rubber stopper is also available as a #3 solid rubber stopper (srs).
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