Carboy Caps – 4 Pk Silicone Caps for Fermenting in 3/5/6 Gallon Glass Jugs – Homebrew Wine, Beer, Mead

These carbon caps work very well easy to install and clean. I have several different mugs of carboys including a few old 5 gal water bottles each one sealed very securely

Perfect! Much better than a cork. No worries about air leakage.

It’s high quality, but isn’t truly universal. I have a 1974 6.5 gallon glass with a screw-on cap, and the cap does not fit. I can press the cap against the lid tightly for the sake of starting a syphon (racking cane in one hole, blow on the other hold *pause*) but other than that it’s useless to me. If it does fit your carboy, it’s a great product

Wonderful value and I like the selection of inlets molded into the caps. The fit isn’t as secure as the expensive orange caps I have but these are fine.

Works on 3 and 5 gal glass carboys. Fit is snug and no more worries about the bung coming out. Reasonably priced and easy to use. Very happy with purchase!

Great find, easy to use for fermentation on a variety of carboy sizes

Form & Fit of these caps is as advertised. Function to be determined with my next use.

So, I didn't know how good these were. I was just looking for stuff to brew larger batches and I came across these caps. If you haven't used these and you're like "is it worth it?" the answer is a resounding heck yeah! If you're using a carboy that takes these caps, you should have these caps! You can clean the carboy with this cap on. A pump of soap, a good amount of water, pop the cap on and shake it like you're getting paid. Nothing comes out. They're airtight, and you can tell when the temperature changes because both posts will lean in or out and when you burp it everything goes back to normal. Believe me, when I need more of these caps, I'll know right where to get them. 8)

Good fit on a 20ltr glas bottle

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These silicone carboy caps are excellent, easy to use and provide a tight seal, they stretch and seal around the carboy opening. These caps are a quality product. ​I use them on the 11.5, 19, and 23 liter carboys made in Italy and Mexico , no issues at all. Some wine when it has a little of residual sugar content left may creature pressure and pop caps off the carboys because of the tight fit. In these cases I will then stretch an elastic band around the cap to give it greater holding power.

Bought these and they fit very well on the carboy. Sit in place and don't pop off. I prefer these over any other bung I have. A modern and effective take on cork/hard Silicone bungs.

Perfect for Carboy jugs.