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Medium Universal sized rubber bung for fermentation air lock

Medium Universal Stopper with Hole

by The Vintage Shop
$2.39 - $2.39
$2.39
$2.39 - $2.39
$2.39

Medium Universal Stopper with Hole

This medium universal stopper with hole is a flexible fermentation closure for compatible vessels that use a standard airlock. The tapered universal shape helps it fit a range of vessel mouths when a fixed numbered stopper is not the best match.

Use it for beer, wine, cider, mead, starters, and small fermentation projects when the stopper seats securely in the vessel. A stopper should fit firmly enough to hold an airlock without slipping loose, but it should not be forced into an opening that is too small.

Best Uses

  • Universal fit: tapered shape works with a range of compatible vessel openings.
  • Airlock use: center hole is intended for standard fermentation airlocks.
  • Fermentation projects: useful for beer, wine, cider, mead, yeast starters, and test batches.
  • Spare closure: good to keep on hand when switching vessels or replacing worn bungs.

Fit and Sanitation Notes

Clean and sanitize the stopper before use, then confirm it sits securely once the airlock is installed. If fermentation is vigorous, make sure the airlock or blowoff setup can handle the activity. Replace any stopper that is cracked, sticky, hardened, badly stained, or difficult to sanitize.

For related fermentation supplies, browse our fermenters and accessories and brewing equipment collections.