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Versatile stopper fits Erlenmeyer Flasks made by Pyrex and others (not ours,
but other ones that take a #10 to 10.5 stopper). Use as an airlock for yeast
culturing, and even more useful as a sterile shield when preparing media. The
proprietary foam is heat-resistant, and will withstand autoclaving or pressure
cooking, making it an ideal flask plug when preparing sterile wort and agar.
The honeycomb structure of the foam lets the plugged flask breathe, yet
bacteria and wild yeast are filtered out and cannot reach the media. This means
you can put your media in an Erlenmeyer flask, plug with a Foam Stopper, and
pressure cook to sterilize, fully confident that bacteria and wild yeast will
not enter the flask, even during the cooling and later storage period outside
the pressure cooker.
Note: This stopper does not fit our Erlenmeyer Flasks, but fits many 2000 ml
flasks sold by Pyrex and others. This is also great as an airlock on a Better
Bottle 5 or 6 Gallon PET Carboy.
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