Dimensions as advertised but isn't snug in any of my standard stoppers purchased from Morebeer. Copy should read place one end in standard carboy hood instead of stopper? It's OK if it slides a little? IDK. Will have to find a hack per Jason Schafer's review below. I guess spring for the 1/2" version if you want a snug fit in a standard stopper.

I used to use long PVC tubing, but those were a mess to clean and took up lots of space where I stored my carboys. These take up minimal space, are easy to clean, and eliminate the risk of blow off. I only wish I had bought these sooner.

I used to use long PVC tubing, but those were a mess to clean and took up lots of space where I stored my carboys. These take up minimal space, are easy to clean, and eliminate the risk of blow off. I only wish I had bought these sooner.

My airlock clogged and blew up again. I didn’t even brew a big beer. My solution was this item. Plop the short end into your bung and the long end into a pitcher filled halfway with sanitizer. Easy peasy. Compact yet enough room to wrap insulation around my glass carboy. I don’t even need to use the keg lube to seal it.

This has made life so much easier when trying to attach a blow off tube. So much so I bought an extra one on my next order

My last IPA filled the airlocks with foam so I ordered four of these. With a normal grommet the 3/8 steel tube doesn't make a tight fit. I added 1 3/4" of 7/16 clear blow off tube to the top of the steel tube and that did the trick. It will still be much easier to clean than using all flexible blowoff tubing. I'll use these on my next double batch of belgian wit...

Got this to help with some massive foaming from D-IPA, it works amazing and the amount of bubbles and sludge it produces almost makes it own beer in the bottle I use for overflow.

I started to use this after adding Servomyces to my wort which resulted in a lot more yeast activity that clogged up my airlocks. Stainless steel is easy to clean and much better than blow of tubes.