DetailsBreathable foam stoppers will withstand boiling or autoclaving temperatures, making them ideal for use in preparing a yeast starter. Fits 2000 ml & 5000 ml flasks.
- Details & Instructions
5.0 / 5.017 ReviewsKeeps the yeast in the starter happy and cleanIt keeps out dust and it also relieves the pressure from the CO2 so the yeast are in better health. I replace it every year as a precaution.February 22, 2014Keep it cleanReally good for yeast growth. This is the second I've bought. The first I kept in a bin with bottle caps, twist ties, etc. Realised my mistake when a starter went sour. If the porous material get's dirty even sanitizing won't do much good. Keep it immaculate or replace it regularly.February 20, 2014Lets Oxygen in and CO2 outI use this for my starters so the yeast and starter solution can get rid of CO2 and get in fresh O2 so the yeast grow faster,February 8, 2014Better than a stopper for startersFor starters you want the free exchange of gasses and no pressure on the yeast._x000D_The stopper is easy to sanitize by soaking in Star San, and then lets the CO2 out.January 23, 2014Instant air lock for flasksEasy to use ,just dip in Star San and insert it in the top of the flask._x000D_Easy to clean, just wash with dish liquid and warm water._x000D_Better than an air lock and stopper because the yeast aren't under pressure and Oxygen can reach the yeast.December 4, 2013Bug barrierIt lets the air flow in and keeps out dust and bugs so my yeast starters can glow without contamination. This size fits the 2000ML flasks better than the other sized foam stoppers.October 8, 2013needed to make a starter in a flaskI was a bit weary to use one of these when I first started making starters. I thought that the yeast needed to be airtight in the flask just like when fermenting. This allows airflow in and out of the flask but also filters that air. I haven't had a contaminated batch using this yet. And every starter I have made has only made the beer better than the first time I brewed it with direct pitch. So yes, this item is worth it.August 5, 2013Keeps the starter safe from dust and bacteriaI soak it in Star San, squeeze it dry and seal up my starter flask with it. I've never had an infection and it allows the carbon dioxide to vent and Oxygen to enter.July 26, 2013great simple productThis foam stopper has done many yeast starters for me. I just soak it in star san, squeezing it under the surface and letting it soak it up, then wringing it out. It has always worked well for me, no starters gone bad. Price is good too.July 26, 2013Seals an Erlenmeyer flaskWhen I make a yeast starter I seal the end of the flask with this foam stopper (that I sanitized ahead of time. It keeps out dust, that can carry microbes and wild yeast, but allows CO2 and O2 to freely flow. Yeast in starters want O2 and should be constantly Oxygenated.April 2, 2013
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