Foam Stopper (Autoclavable)

Foam Stopper (Autoclavable)

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Use this foam stopper with your Erelenmeyer flask when making a yeast starter. Aeration is an important aspect of making a strong, healthy starter. This is why we recommend using a stir plate, which provides continuous aeration. This foam stopper will allow air to flow freely into your flask while keeping pesky bugs and other contaminants out. A quick spray down with sanitizer is all you need. Suitable for flasks or other vessels with an inner diameter opening of 35-45mm (1-3/8" - 1-3/4").

  • Reusable
  • Resists alcohols, bases, esters, and dilute acids
  • Autoclavable up to 249°F (121°C).
Community Q&A

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Why did you choose this?
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Need it for yeast starting
Harold N on Nov 19, 2020
Stopper for my yeast starter flask
Orion K on Aug 27, 2020
Need it for yeast starting
Harold N on Nov 19, 2020
breathing release yeast
Gary Sanger on Sep 22, 2020
Stopper for my yeast starter flask
Orion K on Aug 27, 2020
yeast starter
David San C on Jul 28, 2020
I make a lot of starters, but but typically use tin foil
Horst Sprader on Jul 4, 2020
Pete T on Jun 9, 2020
Need for flask
Winfrey J on May 28, 2020
Better than tinfoil
Drewbrewski on May 28, 2020
Making yeast starter
Myles F on May 20, 2020
need it to make beer
Valued C on May 13, 2020
old one is getting scuzzy looking
Eric M on May 9, 2020
For Erlenmeyer flask; while using stir plate
Kerry Shaver on Apr 25, 2020
For Erlenmeyer flask.
Kimberly on Apr 21, 2020
Hopefully will work well with flasks
Roy Westerberg on Mar 17, 2020
My other one was "eaten" by prolonged exposure to sanitizer.
David O on Mar 12, 2020
good price
Marco a L on Feb 25, 2020
Better than nothing
Steven L on Feb 7, 2020
Very useful product for yeast starter flasks.
Douglas B. on Feb 1, 2020
Recommended with Flask
Dale Z on Jan 16, 2020
for making yeast starter
Hyungsoo K on Jan 10, 2020
To fit flask, for making starters
Roy Westerberg on Jan 8, 2020
It works with the yeast starter kit
Aaron C on Dec 13, 2019
I like this is reusable and can be autoclaved to sanitation.
Nelson L on Dec 2, 2019
Mike on Nov 18, 2019
For starter flask, old one is ragged
Steve C on Nov 16, 2019
Other one got mold
Allen R on Nov 6, 2019
Friend recommended
Kim O on Oct 15, 2019
My old ones are, well. . .old.
Ian on Oct 3, 2019
breathing release yeast
Gary Sanger on Sep 22, 2020
yeast starter
David San C on Jul 28, 2020

4.9 / 5.0
8 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yeast starter last minute
I tried this with soy venting sanitized jug and had too watch very careful LOL pay’s to have right stuff. (was out aluminum foil)
October 5, 2020
1 month ago
Works as advertised.
July 8, 2020
4 months ago
Great little stopper
My starter flask just loves her new foam stopper, so spongy, easy to sanitize, and sooo comfortable. Can’t wait for those little yeasty’s to try to get out as there’re in for a big surprise.
Defying gravity
Defying gravity
June 16, 2020
6 months ago
Does the job
Does the job as the stir plate spins away.
June 5, 2020
10 months ago
Fit my 2000 ml Flask perfect!
It fit my 2000 ml Erlenmeyer Flask from my local brew supply just fine. The only reason I knocked off a star is because I got a little wort on it when swirling the flask; and that caused it to stick to the inside of the neck. Upon removing it to pitch my starter, I noticed a tiny bit of foam peeled off and was stuck to the glass. I did cold crash and decant the yeast, so it was in my flask for 2 days total. The residue/foam was easy to remove from the flask and I really can't see where any is missing on the stopper itself. So I'd say the durability is still quite good, but I just wished it hadn't peeled off so easily. In the end it's probably my fault, and I wouldn't hesitate to buy again.
May 29, 2020
6 months ago
Foam stoppers
Making yeast starters is much simpler when using the foam stoppers. Using aluminum foil works but the stoppers are much more convenient.
May 14, 2020
6 months ago
Worked as described. Used with yeast starter.
April 26, 2020
7 months ago
foam stopper
worked well on my flask with propper yeast starter.
November 3, 2019
1 year ago