DetailsBreathable foam stoppers will withstand boiling or autoclaving temperatures, making them ideal for use in preparing a yeast starter. Fits 5000 ml flasks.
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Browse 1 question Browse 1 question and 1 answerBreathable meaning this does not require an airlock? If so, then what's the point if air will be seeping through the stopper?BEST ANSWER: That's right, this takes the place of an airlock. Oxygen is actually helpful when you're making a starter, so it can be good to have fresh oxygen flowing in, but the foam will filter out airborne microbes that might infect it.