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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
16 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Great with a thermowell
These things are excellent when coupled with a thermo-well. I use have my thermowell inserted into the center hole which results in a tight enough fit to be airtight. I then connect tubing to the offset holes for my blow off and drop the other end in a container of vodka. Works much better than a bung and airlock and allows me to monitor the temperature of the center of the wort instead of just the outside.
October 15, 2012
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
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
Arrived and works as expected...
Way better than using a bung!
November 30, 2015
Awesome product! Better than using an airlock, just cap the Carboy, and attach a blow off hose
September 15, 2013
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
Must-have item
I love my carboy caps. I have one for every carboy and they are so handy. Another use I find for them is when sanitizing and rinsing, I can fill the carboy with a gallon of solution, cap it and shake easily with a perfect seal that's more reliable and easier than an undrilled bung. I also highly recommend the carboy handles for increased safety when man-handling carboys.on a side note, I'm a little surprised by the suggested siphon technique of blowing into the cap. It's awesome, and I'd never thought of it. Generally speaking isn't breathing or blowing into your wort/beer ill-advised? I hope they gargled with Wodka or something ;) The mouth is the second most fertile place for nasties going, second only to your beer!
September 8, 2012
The little things
I love these things. I always felt like bungs weren't snug enough so I use these guys in their place. You can fit an airlock in one of the holes and leave the white plug on the other... at least that's how I use them. :)
August 26, 2012
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
Better than a bung
These carboy caps are fantastic. 1/2" tubing fits over the off set hole for any easy blow-off solution.
November 16, 2011
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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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