Foam Stopper - 1 3/4”

Foam Stopper - 1 3/4”

  • $3.29


Foam stoppers are used when you want to allow airflow in and out of a flask or other vessel, while still blocking out bacteria and other aerial debris.

This is preferable for fermenting some things, such as Kombucha, where you want plenty of oxygen to enter the fermenting vessel while still relieving pressure and protecting from environmental hazards. A stopper and airlock only ever lets pressure out, preventing any gasses from entering the vessel.


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