Senior Round Airlock – Easy to Use, Easy to Clean

This senior round airlock is one of the simplest and most effective styles for home fermentation. Designed to let CO₂ escape while preventing air from re-entering the fermenter, it helps maintain a clean, stable fermentation environment.

How it works:
• Half fill the airlock with water to create a protective seal
• Insert it into a rubber or silicone bung, or directly into a grommet on your fermenter
• As fermentation begins, excess gas bubbles will escape, while   while airborne contaminants stay out

Using an airlock is a reliable, hygienic way to ferment your beer, wine, or cider — keeping insects, dust, and vinegar flies well away from your brew.