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Silicone Stopper (Breathable) - Carboy

Silicone Stopper (Breathable) - Carboy

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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 0.10LBS
Community Q&A

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Browse 2 questions Browse 2 questions and 23 answers
Why did you choose this?
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Works great for secondary fermentations
Andrew P on Nov 27, 2018
just giving it a try
Jerome J Ferguson on Oct 15, 2018
Works great for secondary fermentations
Andrew P on Nov 27, 2018
I have several, they work well for me
Kevin R 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
Looks like a good answer vs. refilling fermentation locks for long holds
William H on Apr 3, 2018
Want to try ditching the bubbler
Alex Fenocchi on Mar 20, 2018
Have one and love it. I use plastic carboys which can suck in water from a regular airlock when flexed when moving.
Karyl N on Jan 25, 2018
I want to fill holes in things
I have several, they work well for me
Kevin R on Oct 24, 2018
No need to top-up airlock during bulk ageing
Valued C on Sep 24, 2018
Will this fit the one gallon glass jars?
Keith Smith on Sep 3, 2018
BEST ANSWER: No, absolutely not. I just tried it several times. You can force it in, but it always pops out. Don’t know why they wouldn’t make a #5 breathable. Maybe reach out to the company.

4.6 / 5.0
12 Reviews
5 Stars
4 Stars
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1 Star
Good replacement for a standard airlock
I love these stoppers - use with my Anvil brew bucket since I can’t fit an airlock in the fermentation chamber. Works as well as a traditional airlock in my opinion - let’s the CO2 out, doesn’t let any bugs in.
July 8, 2018
5 months ago
Way better than maintain fermentation locks
I stage my wines for a bit in carboys and this stopper is a nice no maintenance answer vs. topping up carboys. It's not unusual for me to have 10 or more carboys in-process so this is a time saver for me, and piece of mind.
April 7, 2018
8 months ago
These might work great but you have to buy the correct size. These do not fit my carboys. If you have plastic carboys you need a size 10. I have 5 of the wrong size, but can use them on gallon jugs.
February 19, 2018
10 months ago
Effective & easy to use
Have switched over (from rubber type with a trap) to silicone with the flap. Very easy to clean and use. Don't need to use a water/alcohol filled trap. Stays put and easy to remove. Works as expected.
February 17, 2018
11 months ago
Great when stacking carboy carriers 3 high and 3 deep...
January 27, 2018
11 months ago
great alternative to a typical airlock
These are a great alternative. No need to fill--or top up--with water. They also prevent any backflow of air (such as when cold stabilizing). One caution: when wet they are quite slippery and can pop up. It helps to give them a twist as you're inserting them.
January 24, 2018
11 months ago
Nothing Better
I have been making wine for 15 years and was in a continual search for "the" best stopper available always coming up short in one area or another. That is until now. When they first became available I bought two for a trial run, impressed I bought four more. Finally, I got fed up with messing with the bubblers and bought 10 more. If you are serious about your wine making procedures then you must own these. There is nothing better in market place than the silicone breathable stopper.
Two important features you will be impressed with -- 1. they don't need water to work 2. They don't extend the height profile of your carboy by six or more inches.
July 4, 2016
Best Carboy Stopper Yet
I have tried many stoppers and no matter how dry the stopper or carboy neck, they don't fit well. This works like a charm! Push down the top and it seals tightly When you open it you can actually hear the vacuum break.
October 21, 2015
A better way to go
I've use these for beer and wine making for three years. I don't see any reason to revert back to the bubblers.
August 7, 2015
Simple device-excellent results.
These are very high quality. I have these on all my carboys. good positive seal. I am buying more.
May 3, 2015