CellarScience® Universal Breathable Bung (Medium) | Fits Stopper Sizes #8–#9

CellarScience® Universal Breathable Bung (Medium): Safe, Secure, and Sanitary

Reliable Venting Without the Hassle of Traditional Airlocks

The CellarScience® Universal Breathable Bung (Medium) is a self-venting, food-grade silicone stopper designed to replace traditional stoppers and airlocks. With a gentle taper and a locking ridge, it stays firmly in place—even during vigorous fermentation or temperature swings. Its smart vent system allows CO₂ to escape while preventing oxygen and airborne contaminants from entering, protecting your brew from spoilage or oxidation.

Key Features:

• Secure Fit: Ridge and tapered body prevent the bung from slipping or being pulled into the vessel.
• Self-Sealing Vent: Designed to vent excess pressure without letting air back in, preserving the anaerobic environment.
• Low Maintenance: Easily cleaned and sanitized for consistent, reliable use.

Fit & Compatibility:

• Replaces Stopper Sizes: #8 and #9
• Stopper Dimensions: 1.36" x 1.89" (34.5 mm x 48 mm)
• Flapper Length: Protrudes approximately 2.5" for easy handling and installation

Great for Wine, Beer, Mead, and Cider

Perfect for both home and commercial setups, the medium-sized CellarScience® breathable bung ensures your fermentations are protected and stress-free. Ideal for vessels that traditionally take #8 or #9 stoppers, this bung is a must-have upgrade for any brewer or winemaker looking for convenience and reliability.