Foam stopper
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- Amazon.com (USA)
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- Amazon.co.uk (Europe)
- More Beer! (USA)
- Ontario Beer Kegs (Canada)
- eBay (USA)
Used in:
A foam stopper keeps bugs and other contaminants out of your flask while making a yeast starter. Unlike an airlock which only lets CO2 out, a foam stopper also allows air to flow freely into your flask for continuous aeration. Useful if you have fruit fly issues, otherwise aluminum foil works fine.
For more information see our Making a Yeast Starter guide.
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