The rubber cap fits firmly on the wide mouth and prevents the ingress of impurities and oxygen, promoting stable, contamination-free fermentation.
The highly elastic material adapts to various vessel diameters and makes fitting and removal easy without damaging the rim.
After removing the plug, an opening is created for fitting an airlock, which safely vents CO₂ and protects the beverage from drawing air back into the vessel.
This quality rubber fermentation stopper is an ideal choice for home production of wine, beer, and other fermented beverages. It provides reliable sealing and helps maintain a clean environment free of unwanted microorganisms, which is key for stable and safe fermentation.
Thanks to its flexible design, the cap is easy to fit onto wide-mouth demijohns and other suitable containers. After removing the central plug, you get a closure with an opening for an airlock, ensuring smooth release of carbon dioxide without the risk of air being drawn back into the vessel.
