Silicone Stopper (Breathable) - Carboy

Silicone Stopper (Breathable) - Carboy

In Stock
60 day no hassle return policy. Details

Fits 3,5,6 & 6.5 Gallon glass carboys and 500ml flasks. A breathable Silicone stopper that acts as both a stopper and an airlock. Unique design allows CO2 pressure to escape but keeps Oxygen and airborne contamination out. Quickly became our stopper of choice for wine. Used by numerous commercial wineries. Also has great application for beer ferments: Will create a vacuum if fermenting wort cools (as opposed to pulling water in from your traditional airlock.) Air tight seal is great for extended fermented lager when CO2 production is still present but very slight. The top measures 1 1/2" wide and the bottom is 1 1/8" wide.

While the FE479 carboy stopper is a great, economical choice, you may also want to check out our premium, breathable, silicone carboy hood FE496 as well.

Item # FE479
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.10 LBS
Community Q&A

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 2 questions Browse 2 questions and 4 answers
Why did you choose this?
MoreFlavor Store
Smaller profile will help fit my carboys in my closets easier
Zach J on Jun 16, 2020
Shorter than a traditional bubbler airlock.
WILLARD D on Jun 3, 2020
Smaller profile will help fit my carboys in my closets easier
Zach 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
Wanted to buy them for a while. Got them now to get free shipping.
Mihai Bordea on Apr 18, 2019
more compact storage during fermentation
John E S on Feb 27, 2019
Simple lock
Todd Hilsmeier on Feb 11, 2019
Josh F on Feb 5, 2019
worth the money your the best.
john morton on Jan 11, 2019
Looks like a nice alternative to liquid filled airlocks.
Brad B on Dec 31, 2018
Works great for secondary fermentations
Andrew P on Nov 27, 2018
I have several, they work well for me
Brewdude on Oct 24, 2018
just giving it a try
Jerome J Ferguson on Oct 15, 2018
No need to top-up airlock during bulk ageing
Valued C on Sep 24, 2018
need it.
Mark H on Sep 24, 2018
Best one
Roger H on Sep 19, 2018
Much better than bubbler.
Edward G on Sep 11, 2018
just wanted some caps for my carboys
Levi A G on Sep 10, 2018
Tried 3 last year and am converting over. No more topping maintenance
William H on Sep 5, 2018
they work
steve m on Aug 28, 2018
Trying for first time
Robert A on Aug 21, 2018
Great alternative to an airlock, don't have room in my fermentation chamber for a full airlock.
Dalton R on Jun 26, 2018
have more carboys now
Heart Wood C on Jun 6, 2018
Perfect for a 500ml starter
Art Blackwood on May 15, 2018
Matthew T on Apr 17, 2018
word of mouth
Peter T on Jun 15, 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
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.
Doe this fit bubble big mouth opening in lid?
Shawn Wilson on Jun 28, 2020
BEST ANSWER: I have used it successfully in my Big Mouth Bubbler. It fits the bunghole in the top quite nicely. One reservation: this stopper has a bit more resistance than a traditional liquid-filled airlock. During primary fermentation, when a lot of CO2 is escaping, it has resulted in the lid of the BMB being lifted up a bit. During aging, I've never had this happen.

4.8 / 5.0
25 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
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
4 weeks 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
3 weeks ago
I love the cap. and It's easy to swirl the carboy without worrying about a conventional bubbler.
June 12, 2020
1 month ago
great product.....I will want more
May 22, 2020
1 month ago
These were perfect for the barrels we need to bung! Shipped fast!
April 8, 2020
3 months ago
Great Product
These work great, no water to add, ever
March 19, 2020
3 months ago
Just what we needed
We use these for 5 gallon carboys for wine and love them. Way better than the old type that are plastic and fill with water.
December 4, 2019
7 months ago
This is NOT a #10 size for Better Bottle
The bungs are fine, but be careful when choosing this item. This is a #7 size for glass carboys. The descriptor only says "carboy". If you are expecting to get a "carboy" size for the 6 gallon Better Bottle (or similar) you need the #10 size.
November 22, 2019
7 months ago
Great for bulk aging
I use in carboys when aging brett beers so I don't need to worry about keeping airlocks full.
November 16, 2019
8 months ago
Silicone is the way to go for bungs. The venting feature is the best.
November 15, 2019
8 months ago