Best Airlocks for Homebrewing (2026)

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An airlock is the small valve that lets fermentation CO2 escape while blocking air and contaminants from reaching your beer. The two common styles are the three-piece airlock, which is easy to disassemble and clean, and the S-shaped bubbler, which is simple and lets you watch fermentation activity at a glance. Both work well when filled to the line with sanitizer or water. The main fit consideration is the stopper or grommet, which must seal snugly in your fermenter lid or carboy neck. Every brewer who ferments in a sealed vessel needs an airlock, so it is truly universal gear. Three-piece designs are easier to clean and refill, which appeals to brewers who like to inspect parts, while S-locks are foolproof for beginners. Keep a couple of spares, since they are inexpensive and easy to misplace. Match the airlock to your stopper size, top it off with sanitizer, and remember that bubble rate indicates activity but is not a precise gauge, so trust your hydrometer for real fermentation progress.