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Question: Would these airlocks fit a 6 gallon glass carboy?
Document: 3 Piece Econo-Lock with Carboy Bung (Set of 2)  .... they fit my 6 gallon glass carboy perfectly. Would buy them again.
Fit into glass carboy with out issue. Perform necessary functions well and wine tasted great once complete. Would buy again.
Exactly what they say you are going to get. Although, I had used 5 gallon water bottles for my fermenting and I had to modify the openings, as these air locks came with extremely small grommets, I assume the glass carboy must have a smaller opening...?
Good price and functions fine as an airlock for brewing. They don't specify the size of the stopper and just say universal. I believe the size would be a 6.5, so if you use recycled Carlo Rossi carboys they won't fit. Fits my larger carboys fine.
Work just like they're supposed to! The cap on one is a little loose, but it hasn't seemed to be a problem. The fit perfectly down in the mouth of a one gallon glass jar or a plastic jug. I haven't tried them on larger fermenting containers, but I'm sure they'd work just as well.
The bungs fit well into the carboy. The fill lines were clearly marked. Began working immediately with the fermentation. The little cups inside would sometimes go off center but everything appeared to work well.
Works like a charm! Fit my 5 gallon carboy nice and snug, built strong and easy to clean! Very pleased with the quality for the price I paid.
With this price it is very good... It fits to my 5gal glass Carboy... Easy to install and in install... Easy to clean and the most important thing is no leak...
These just work and I like them better than the s-tube type airlocks. I fill them with a little high-proof and cork the carboy. Can't be beat for the price.
I bought these to use on a half-gallon growler for fermenting. So far they've been great. They go on without much difficulty and it's easy to take apart the airlocks for cleaning and sanitation.
Answer: you would have to buy a larger size stopper but the holes are universal in all of the stoppers and the airlocks would fit.