Fermentation Rubber Stoppers Drilled Bungs For Use With Airlock (#6.5 Rubber Stopper - 4 Pack)

these fit my big carboys and the hole is perfect for my tubing i use for the bubblers

Have bought these twice. Good quality, have zero complaints about these. Had to do measurements to make sure I bought the right size. Airlock fits tight and secure tightly in the carboy. Have noticed if the inside rim or the rubber is wet they tend to slip out of the carboy. Can be solved with making sure those are dry or taking a rubber band and wrapping around the finger loop and over top of the stopper.They are a little pricey in my opinion but should last a lifetime.

I needed to center a shaft inside a tube in order to pour a polymer sleve on it. These were easy to drill to the right size and worked perfectly.

You have to make the top of the stopper flush with the lip of the glass or else the rubber stopper will slip out. Almost lost a batch until I realized the stopper was loose.

these are made of good 'rubber' are true to size and they doesn't walk out out of the carboy as easy the the silicon ones do.

Using it for fermentation in a fermenter

Help me find the perfect size for my jugs.

I bought these for a different purpose than intended. Unfortunately, it didn't meet my needs and I returned them. The return process was quick and easy. I love Kohl's drop off.