Carboy Bung (Silicone) - Breathable

Carboy Bung (Silicone) - Breathable

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This high quality Silicone Stopper gives a great airtight seal while still allowing gasses to escape. 
Fits 3,5,6 & 6.5 Gallon glass carboys and 500ml flasks. This breathable Silicone Carboy Stopper acts as both a solid stopper and an airlock. The unique design allows CO2 pressure to escape but keeps oxygen and airborne contamination out. Beer makers love using it during the ferment because it creates a vacuum when the wort cools, instead of pulling water in from your traditional airlock. The airtight seal is great for extended lager fermentations when CO2 production is still present but only very slightly. 
Measures 1 1/2" wide at the top and 1 1/8" at the bottom.
You may also want to check out our Premium Breathable Silicone Carboy Hood.
Item # FE479
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.10 LBS
Community Q&A

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Bulk aging
Ryan B on Nov 17, 2020
water in airlock never runs dry
Doug H on Nov 14, 2020
Bulk aging
Ryan B on Nov 17, 2020
I no longer need to worry about carboy pressure with these.
Jeremy N on Nov 16, 2020
water in airlock never runs dry
Doug H on Nov 14, 2020
Heard about these on a youtube video - need something shorter than s-type for fermentation chamber
Alexandra O on Nov 4, 2020
GIULIO G on Nov 3, 2020
Super easy to keep clean
Shad S on Oct 24, 2020
Fool-proof, compared to airlocks that can run dry.
Doug H on Oct 11, 2020
I love these for long term aging
Zachary J on Oct 8, 2020
Recommended by fellow mead makers
Shad S on Sep 22, 2020
Could not find a #6 or #6.5
Elizabeth J on Sep 5, 2020
They work on big barrels
Luis H on Sep 3, 2020
I’m a bit tired of the old airlock
george j on Aug 29, 2020
No room in my fridge to use traditional bubblers (too tall)
Jesus V on Aug 24, 2020
Chris H on Aug 13, 2020
Heard they are good for wine storage
Mark D on Aug 7, 2020
Can always count u having what I need
James A on Aug 6, 2020
Need them
Adam L on Aug 5, 2020
Post fermentation storage
Matthew S on Aug 5, 2020
i like the idea
Timothy M J on Aug 4, 2020
plug some carboys
Robert W on Jul 22, 2020
i really want is because it is not rubber
christopher h on Jul 20, 2020
Smaller profile will help fit my carboys in my closets easier
Zachary J on Jun 16, 2020
word of mouth
Peter T on Jun 15, 2020
Shorter than a traditional bubbler airlock.
WILLARD D on Jun 3, 2020
to use in my carboy's and barrel. would like to smaller ones for 1 gallon carboy's
michael c on Jun 2, 2020
JP K on May 30, 2020
Roland B on May 28, 2020
Heard it was a better option than bubblers on some YouTube video
Bill D on May 28, 2020
Doin the most told me to get them
Timothy S on May 28, 2020
Just read about them and you have a decent price.
David Somers on May 27, 2020
Long aging in carboys
Charles S on May 23, 2020
Cold crashing and lagers
Peter B on May 22, 2020
ordered 2 to test replacing standard airlocks with the aterless ones for bulk aging
Conrad A W on May 20, 2020
Lucas A on May 19, 2020
I Like
La Forge Family V on May 12, 2020
Robin O on Apr 30, 2020
For long aging
Charles S on Apr 20, 2020
Received good reviews, would like to give it a try.
William M on Mar 11, 2020
I have some already that work great
Frank P on Mar 6, 2020
So I can age my spon without an airlock drying up
Geovanne T on Mar 3, 2020
cold crashing
Joseph A Nance on Feb 6, 2020
Use this guy for my wine carboys.
Bonnie M on Nov 11, 2019
Expensive, but eliminates need for other co2 release valve
Burt E on Oct 31, 2019
Tried them out and love them - they work really well.
Mark Bales on Oct 28, 2019
I age my beer a long time.
Geovanne T on Oct 1, 2019
might need it
Kenneth W on Aug 28, 2019
we have some and love the
Mary C on Aug 28, 2019
Updating equipment
Roger Ladd on Aug 28, 2019
Easier than 2 part stopper
Pamela S on Jul 7, 2019
Recommended by more advanced winemakers
Susan P on May 29, 2019
I no longer need to worry about carboy pressure with these.
Jeremy N on Nov 16, 2020
Heard about these on a youtube video - need something shorter than s-type for fermentation chamber
Alexandra O on Nov 4, 2020
Doe this fit bubble big mouth opening in lid?
Shawn Wilson on Jun 28, 2020
BEST ANSWER: I prefer the breathable stopper than the 3 piece airlock as I no longer have to monitor the liquid level. Place it on top of a carboy or the Big Mouth lid and walk away until ready to bottle or keg.
Will this fit the one gallon glass jars?
Keith Smith on Sep 3, 2018
BEST ANSWER: They fit and seal well.
Like any other stopper, it needs to be dry when inserting -- dry inside the mouth of the carboy too with a clean paper towel.

4.9 / 5.0
32 Reviews
5 Stars
4 Stars
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1 Star
Love them!
Soooo much better than airlocks & such! Easier to clean, sanitize & maintain. A sensible alternative!
October 29, 2020
1 month ago
I love these things..... I'll never go back to the bubblers.
October 22, 2020
2 months ago
Much better than using a stopper and air lock, just make sure its not too wet or it will pop out if brew is degassing
September 26, 2020
3 months ago
great item
I love this, although the pressure does tend to work it out of the neck of a glass gallon jug that I use for brew.
September 18, 2020
2 months ago
Great stopper that stays put and doesn’t pop loose
August 6, 2020
4 months ago
Very nice!
Excellent! Wish I had done this sooner.
August 5, 2020
4 months ago
Works Great!
Doin The Most made a “TOP 10 HOMEBREWING HACKS” video where he talked about these and they just made a lot of sense. They work great too!
August 1, 2020
4 months ago
Great air checks
I have wanted to try these out for a long time. They are great sure beets having to watch the water level.
June 29, 2020
5 months ago
Works well for cold proofing wine in the refrigerator since there is not much clearance between the top of the carboy and the roof of the frig. It seals so tight when I try to remove the cork after a month of cold proofing I can hardly get the cork out since the vacuum seal is to tight !
June 29, 2020
5 months ago
I love the cap. and It's easy to swirl the carboy without worrying about a conventional bubbler.
June 12, 2020
6 months ago