Breathable foam stoppers that withstand boiling or autoclaving temperatures, this makes them ideal for use when preparing a yeast starter. The structure of the foam act as a filter blocking any airborne bacteria or wild yeast that might enter the flask. These foam stoppers are 46-60 mm wide and fit 2000 to 5000 ml glass flasks.
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Love this size
I use This size to seal my 2ltr starter flask AND my big mouth bubbler fermentor during cold crash. The smaller foam stopper will not work for either of those task. Buy an extra as they are handy.
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Best ever for cold crash in a big mouth bubbler
Used it to fill the big mouth bubbler bung hole for cold crash. Works fantastic
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Works great
Works great. Nice change from using foil on top of starters.
