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Foam Stopper 35-45mm

$2.29
& Free Shipping over $40 Details
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Product details

Breathable foam stoppers will withstand boiling or autoclaving temperatures, making them ideal for use in preparing a yeast starter. The honeycomb structure of the foam stoppers will act is a filter for any airborne bacteria or wild yeast that might enter the flask. That important because a lot of air is sucked into the flask while it is cooling. You can also leave the stoppers on the flask instead of a fermentation lock. Some people use foam stoppers to replace fermentation locks in their carboys, too.

The small foam stoppers are 35-45mm wide and fit our 500 or 1000 ml borosilicate glass flasks, or a glass carboy.

Additional information

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Customer Reviews

Based on 9 reviews
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M
M.D.

Its a foam stopper. It fit the erlenmeyer. End of story.

j
j.k.
Pretty nifty!

Actual diameter is 45mm or 1 3/4". My Kimax 5000ml flask has a 42mm opening and this fits perfect. It can of course be squished as small as you want it.

J
J.M.
Silencing the wife and promoting algae growth

I freakin love em. I stuff em in my ears so I don't have to hear the wife blabbering. And they provide the appropriate air exchange for my algae cultures.

J
J.N.
Works perfectly

Works perfectly. Allows air in to oxygenate started and keeps dust out.

D
D.A.
Functional

As cheap as these things are (NB please don't up the price) I buy a few with each order I make. They're easily sanitized, and actually could take a lot of use before being pitched. Follow their sizing instructions to make sure you're buying the right size for your e flasks.

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Foam Stopper 35-45mm

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