This is a great solid bung that is easy to fit tightly, yet always easy to remove. I'm never going back to the solid rubber bungs! Great price too.

I really prefer these stoppers compared to the non-universal stoppers. The non-universal stoppers fit snugly, but a bit too snugly for my taste. I say that because I have had those stoppers nearly get stuck in the carboy. I never had one get stuck but it is kind of annoying to have to pull a stopper out of a carboy with pliers. You don't have that issue with these.

The Better Botte solid plug works great and fits the BB to a T. As others have said it is great for cleaning. Also, it is easy to remove and keeps the better bottle clean when sitting unused for awhile. I'll probably buy a spare at this price.

Very useful for cleaning the carboy. Great price.

I use this in a 2 liter pyrex flask that is list to take a Number 10 stop. This stopper fits very nice and i use it for sloshing the cleaning solution.