North Mountain Supply Italian Twin Bubble Fermentation Airlock with Grommet and Universal Carboy Bung – 2 Pack for Home Brewing and Wine Making

These are quality air locks. They are not the least flimsy good sturdy equipment. With everything needed for proper use. Only problem I've had is it lacked instructions on how to use them.

Love these airlocks. Function is basic - an airlock is an airlock. But where the 2-piece and 3-piece airlocks randomly put up one bubble and settle, you can better see the bubbles move through this. And they're musical! Get several batches going together with slightly different fill levels, you get a whole melody.

A little hard to get the proper amount of distilled water into the u-bend, the liquid tends to shoot out the top or get sucked back into the carboy when you're moving it, but otherwise works as expected.

Great airlocks that did the job for me. Used on glass carboys. It’s been my experience that many openings on carboys even of same gallon size will vary. I would recommend getting a multi size bung selection pack just to be sure.

Good quality and at a decent price.

Got what I expected

Good these are extremely good you make your own lids the grommets are really tight seal they're thick they got a cap on them you don't have to drill any holes very nice or functional and they're definitely worth the value Great company buy from them and you will not be sorry because you're not getting any Chinese young crap Great company about a half inch hole or one size below 1/2 in and your goat and you're golden clean them would I do is I put them close to the or right against the water tap in the kitchen I just blow hot water through them if they have residue in them I got coffee pot maker cleaning tabs and I just throw a couple in a pot and I soak them and then I blow them out just like I said with a hot water these are great easy to use great product from Italy and they fit beautifully best product that I've come across for this type of item not Chinese them everything that comes from kind of s***