#11.5 Drilled Rubber Stopper (DRS)
$9.99
The #11.5 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper. The top diameter is 2.5", the bottom diameter is 2", and it has a 3/8" hole drilled in the center, the perfect size for an airlock.
The 11.5 rubber stopper is also available as an #11.5 Solid Rubber Stopper (SRS).
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