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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

4.7 / 5.0
40 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
It did the job well
April 8, 2019
7 months ago
Used to remove airlock and use tin foil for cold crash now I just sanitize and pop this on top. Havent got the chance to ferment with it yet but appears you could just stick a hose right in and run to a container of water and never remove your top for cold crash again.
April 3, 2019
6 months ago
Better options are available
They do work but better of just buying the silicone waterless airlocks, they are magical.
March 2, 2019
1 year ago
Very handy!
November 15, 2018
1 year 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
1 year 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
Customer Q&A
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Browse 3 questions Browse 3 questions and 9 answers
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?
WSW 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.
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.

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