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Rubber stopper

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castillo

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I have a 1000ml flask that takes a #9 stopper. But I can't seem to find a #9 stopper. I plan on making a yeast starter for my next brew in this flask. Any suggestions? Thanks.
 

JewBrew

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Cover it loosely with a rubber band an plastic wrap or tin foil.You could always go with the old fashioned hole-in-a-balloon air lock.
 

Sacdan

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Don't use a stopper when making a starter. Use a piece of snitzed foil. You want Oxygen to get in and Co2 get out.
 

wyzazz

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Loosely crimp a piece of sanitized tinfoil on that flask and you're all set!
 

RiverCityBrewer

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I used a stopper one time for a starter, now its just foil as it is much easier to deal with when using a stir plate to allow for a good gas exchange.
 
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castillo

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I was planning on a using a stopper with an airlock. Does oxygen not get in with an airlock?
 

wyzazz

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Nope, things get out not in with an airlock. Think of it as a check valve, it lets pressure out but not back in.
 

k47k

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an 8 1/2 stopper fits a standard 1000ml flask.
 
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