Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: if these don't fit on carboys as all the customers have stated, why do you sell them for and claim they fit carboys?
Document: Just what I needed for my two glass carboys (3 gal each). They fit snuggly and seal against air leaks.
It is exactly what you see, but unfortunately they dont fit either of my 2 carboys. Not a bad price for a mistake though.
These airlocks are nothing new. But, the stoppers are unique. They are hollow and pliably. So, they fit into the carboys easily and are very easy to keep clean.
These are by far superior to single airlocks and are excellent for 5 and 6 gallon carboys. Will not fit 1 gallon, buy rubber stoppers and airlocks separately.
It suits the purpose. The quality is good, but the bung size could be larger in order to fit all carboys. It just barely fit a one gallon apple juice bottle, so you get the picture. Good price.
I used them on 6 1/2 glass carboys. They fit tight and stay in. The ring is good around the top to keep them from going in to far also. Great Product fast shipping! !
I used them on 6 1/2 glass carboys. They fit tight and stay in. The ring is good around the top to keep them from going in to far also. Great Product fast shipping! !
although this set is a great deal, buyer should be aware that these rubber stoppers DO NOT fit for plastic carboys. now I have to go buy some rubber corks from the local home depot / lowe's so that these aren't a complete waste. seller needs to update info! DOES NOT FIT PLASTIC CARBOYS!
These are Great air locks and very inexpensive. Works great on numerous carboys. Do not hesitate to purchase these fermentation locks.
This was  great price on the whole set up. I not only needed the bungs but the airlocks as well. They shipped out quick and should work out great on the carboys.
Answer: They fit my 6 gallon glass carboy fine, however the bungs are to slick and pop up and release pressure around the bung not through the airlock, fortunately I had a few rubbery ones laying around and used those. However for the price the airlocks are great!