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This glass airlock is designed to fit precisely into rubber stoppers of demijohns and other fermentation vessels. It ensures one-way venting of fermentation gases, minimizing the risk of oxidation and off-flavors. The clear design lets you visually check fermentation activity in real time.
For optimal results, we recommend regularly checking the liquid level in the airlock. To reduce evaporation, you can use alcohol or another less volatile liquid instead of water. Thanks to its universal dimensions, the airlock fits most home fermentation setups and offers long service life thanks to its durable glass.