Simplify beer and wine fermentation with a silicone bung that works as both a stopper and an airlock. The CellarScience Universal Breathable Bung for glass carboys vents CO₂ through its flapper design while helping keep oxygen and airborne contaminants out.
Unlike a traditional water-filled airlock, this breathable stopper does not draw airlock liquid into your beer if cooling wort creates a vacuum.
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Material: Silicone
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Function: Combined stopper and breathable airlock
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Glass carboy fit: 3, 5, 6, and 6.5 gallon carboys
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Additional fit: 1 gallon bottles, growlers, and 500 mL flasks
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Replaces stopper sizes: #6, #6.5, #7, and #8
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Stopper measurements: 0.94 × 1.48 inches (24 × 37.5 mm)
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Flapper stem: Protrudes approximately 2.5 inches for assembly
Includes: One glass-carboy bung with flapper stopper. Check your vessel opening against the listed dimensions before ordering.
