Silicone stopper acts as both a stopper and an airlock. It’s unique design allows CO2 pressure to escape but keeps oxygen and airborne contaminates out. It will also create a vacuum when your wort is cooling or if you move your fermenter into a cooler environment (no more sucking back water out of the old airlocks). It's silicone, handles up to 570 degrees, so it can be boiled for sanitizing and cleaning.
Note: Silicone is slippery when wet, so the airlock needs to be dry and the inside neck of the carboy needs to be dry. If they are wet, the airlock will try to pop back out.
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By far this is one of the best inventions for home brewers. So easy and they hold in a glass carboy until the cows come home. Just start with dry surfaces and it’s like super glue. Awesome for long term bulk aging
I'm using it for a longer term aging of a Sach/Brett/Lacto beer in a glass carboy. Working great so far, don't have to worry about airlock drying out.
Bought one to check it out... only bad reviews I have read on other sites are those that dont follow the recommendation of boiling them and making sure they are dry. I figured out boiling is best for normal rubber stoppers, as for these these. After boiling they dry super quick and are malleable and tacky. Putting them in sanitizer makes them slippery and the cold water makes them much less tacky. I want to replace all the airlocks for my long term sours and anything I drop in temp, to prevent airlock suck. But now you are out! Restock please. I have not tried these for primary fermentation though, only secondary. With primary I always use a small blowoff, just in case.