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Standard Carboy Cap

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Standard Carboy Cap

SKU: 7044

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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To use the Carboy Cap: Push a racking cane through the center tube, place on the top of your carboy, blow into the other tube, and a siphon is easily started. May also be used for blow-off when fermenting. Attach a length of 3/8" ID tubing to the hood, and run the tubing into a bucket of water. When used this way, the carboy cap takes the place of an airlock.

Note: This item is only compatible with glass carboys in 3, 5, 6 or non-acid 6.5 gallon sizes.
Details & Instructions

Additional Information

4.8 / 5.0
37 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Very handy!
November 15, 2018
5 months ago
Great for use as a blow off tube
Works as it should. Fits well on a standard glass carbon, even under an over zealous fermentation as a blow off tube.
Works like it is intended, fits well even under pressure!
Works like it is intended, fits well even under pressure!
September 14, 2018
7 months ago
Good Stuff
I picked up one of these to convert a 5 gallon water bottle I had on hand. Saved me the cost of purchasing a carboy, the Racking cane fits perfect as did the vapor lock. I will buy this product again to outfit the other two 5 gallon bottles I have in storage.
February 3, 2017
over 2 years ago
Rethinking this one
It leaked. Had a pin hole in top which I fixed with a hot poker. Also had to put several rubber bands around circumference to seal completely.
February 3, 2017
over 2 years ago
Makes siphoning a lot easier
Using a racking cane, I use a quick blast of CO2 to get the siphon going rather than blowing into the tube.
January 29, 2014
I know this isn't supposed to be used with the better bottle,but I got one & it fits snugly. I put the airlock in the center tube for one week oaking,etc. Working just fine so far on my 6G BB.
November 26, 2013
Helps out a lot when transfering
Makes racking fast an easy, just insert your cane and blow in the other hole and the siphoning starts.
November 17, 2013
These caps make it super easy to siphon without an expensive auto-siphon. I'm confident in the seal they make on the top of the carboy. A bit tight with the Better Bottles, but it still works.
October 14, 2013
Basic equipment for carboy users
If you use glass carboys then you should get this. Its so easy to start a siphon, and you don't even need an auto siphon. You can save money that way, and get something more durable. Its also good for dealing with blow offs, which can be a problem with limited head space.
October 13, 2013
Reduces risk of aeration
I found this cap to be a nice upgrade when siphoning beer from the carboy compared to an autosiphon. The latter almost always starts to leak air into the beer stream half way through, but with the cap I don't have to worry about that anymore._x000D_And by the way, I've tried using the cap on Better Bottle and it worked just fine.
September 23, 2013
Customer Q&A
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Browse 3 questions Browse 3 questions and 9 answers
Will this fit a 6 gallon Bubbler plastic carboy?
A shopper on Jan 12, 2017
BEST ANSWER: I think the bubbler OD on the opening is just about the same size as the glass carboy so it should fit. I also use a clamp on mine to keep it tight for making sour beers and adding a CO2 blanket to the carboy.
Will this fit on a 5 gallon plaster water jug? Like the ones you use in a water dispenser?
A shopper on Aug 24, 2018
BEST ANSWER: I really have no idea, I use mine on glass bottles and not plaster bottles, or plastic.
Can you attach an airlock to this instead of a blow off tube?
walter w on Jun 26, 2018
BEST ANSWER: Yes, I do. Much easier to take on and off than the other types and it stays upright when you set it down with the airlock while testing.

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