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

Good fit on a 20ltr glas bottle

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I love these - they fit really securely on the carboy and are very easy to get an airlock into. Not so easy to get the airlock out, but I prefer that over the airlock coming out on its own. The extra nubs for holding caps is a fantastic feature, and you can take the cap off the opening your airlock isn't in to more easily get the airlock out without chancing sucking some of the water in. These fit common carboys, but unfortunately not my big 30L carboys, which is regrettable as I had to get a similar but inferior (more plasticy with similar two prongs for openings but no cap-holding nubs).

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.