#7 Drilled Rubber Stopper (DRS)


The #7 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper. The top diameter is 1 7/16", the bottom diameter is 1 3/16", and it has a 3/8" hole drilled in the center, the perfect size for an airlock.

The #7 rubber stopper fits most 356, and 6.5 gallon glass carboys. Sits higher in the opening than the #6.5 stoppers.

Frequently purchased with a fermentation lock.

Also available as a #7 solid rubber stopper.