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Standard Carboy Cap - 3/5/6/6.5 gallon glass carboys


SKU# 7044

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Fits standard 3, 5, 6, or 6.5 gallon glass carboys. Put a racking tube through the center spout, fit the cap over the mouth of the full carboy, then blow hard into the second hole to prime a siphon.

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Standard Carboy Cap - 3/5/6 gallon glass carboys

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  • Standard Carboy Cap - 3/5/6 gallon glass carboys
Product Details

Fits standard 3, 5, 6, or 6.5 gallon glass carboys. Put a racking tube through the center spout, fit the cap over the mouth of the full carboy, then blow hard into the second hole to prime a siphon.

Additional Information
Support Documents:No
4.7 / 5.0
18 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
All of the products I order from Northern Brewer are quality products and their service is great!
February 3, 2018
3 months ago
Great Seal
When using glass carboys, I have had trouble keeping a typical bung in place when fermenting wine. The pressure of the CO2 causes the bung to slip out , losing the seal. These caps stay in place.
January 1, 2018
4 months ago
I love these little guys. They're a must have and I can't believe I didn't find out about them sooner.
January 26, 2017
1 year ago
carboy cap
Have not used yet but appears will function as expected
May 1, 2016
Fits Mostly Well
It fits and seals on the neck of a standard carboy pretty well and doesn't want to pop out like a rubber stopper. I did have to trim the material back on the center port a little in order to fit in my airlock and racking cane. I wish it was made of something like silicone instead of vinyl, but it's worth the small cost for convenience.
January 12, 2016
Arrived and works as expected...
Way better than using a bung!
November 30, 2015
Great Product
Can't say enough good things about these Carboy Caps. It's true that the interior on some of these can be rough, but I always get a good seal when used with hose clamps.
December 2, 2014
Good, but QC issue
Good concept, and they are particularly handy for holding a racking cane in place while transferring beer, but two of the three I received had a rough interior surface where it mates with the carboy, and so would not form a good seal. I was wondering why my airlocks weren't bubbling. Check them before using.
January 2, 2014
Use It
Love it. I was trying to siphon out of the carboy without one of these and I was having a hard time. This removes all the problems and the wort transfers in seconds.
December 28, 2013
Very good, but seal is not perfect
I really like the carboy caps to be used with a thermo-well as mentioned also by Scott. Everything works great except the seal is not always perfect in the two 6 gallon bubblers or the 3 gallon Better Bottle I have. This makes the CO2 escape and the bubbling rate through the blow off tube just useless to control fermentation rate. Not a big deal, but annoying not knowing whether fermentation rate except by looking at the krausen.
November 25, 2013
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Browse 6 questions Browse 6 questions and 7 answers
can I push co2 in through this cap to push beer out through a wand?
B K on Jan 15, 2016
BEST ANSWER: Yes you could do that. I would suggest using a hose/worm clamp to hold the bung securely to the carboy- sometimes these don't have the best seal...
Can I buy replacement grommets and o-rings? The unit came with a tiny little rubber grommet and o-ring that allowed the 12" probe to fit airtight inside of the thicker port on the standard carboy cap. I use the 12" probe in that port to monitor wort temp during primary and have a blow off tube hooked-up to the other port on the carboy cap. Only problem is I seem to have lost the rubber grommet/o-ring!
A shopper on Sep 10, 2017
Standard Carboy Cap - 3/5/6/6.5 gallon glass carboys
Standard Carboy Cap - 3/5/6/6.5 gallon glass carboys
ThermoStar® Dual-Mode Digital Temperature Controller
ThermoStar® Dual-Mode Digital Temperature Controller
BEST ANSWER: We do sell a replacement 12" probe, but none of the smaller components that make it up.
If I want to use this to attach a blowoff tube, what size tubing can I use?
N A on Aug 3, 2016
BEST ANSWER: You could put a piece of 5/16" tubing into the smaller inlet, or you could attach a piece of 3/8" tubing to the center stem of a 3-piece airlock, and place it in the larger inlet, the one that is sized to hold an airlock securely. - Mike W, Northern Brewer
Will these fit your one-gallon glass jugs?
M A on Jul 16, 2016
BEST ANSWER: No, but these will fit onto the 3, 5, 6 and 6.5 gallon glass carboys we currently sell. There is no similar "cap" for the one-gallon jugs. A #6 stopper, or a 38mm Screw-cap will fit on the jug. -Mike W, Northern Brewer
Will this cap work on my standard 5 gallon plastic carboy?
J O on May 19, 2016

Thank you for your question. These caps fit on The Bubbler and the Better Bottle along with the standard glass carboys.

Will this carboy cap fit the 6 gallon plastic bubbler carboy?
J O on Dec 27, 2015
BEST ANSWER: Hello John,

Thank you for choosing Northern Brewer! That carboy cap will not fit on a Big Mouth Bubbler. I hope that this helps!

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