Hi All,
I am using a 6 gallon glass carboy which I purchased front NB. Trouble is in the UK we are metric, so our bungs don’t seem to match up.
A standard bung seem to small, it’s really loose with a couple of MM to sprare when I try to insert it into the top of the carboy.
So I purchased a “universal carboy bung” and now that is too big to fit in the regular way, but I can turn upside down and stretch it round the outside of the bottle mouth, it seems tight around the top, although it will come off with a small amount of pressure…