The 5 Best airtight carboy caps (2023 reviews)

Not everyone likes to purchase cap for their regular usage, but the socalhomebrew airtight carboy cap would be an anomoly. These are your typical workhorses 3 piece airlocks designed to let gases out during fermentation. It fits snugly and keeps a good seal. The cap acts as a bubble breaker and helps limit bubbling over if you forget to leave enough room in the top of the carboy. It fits into standard carboy stoppers and work well.

The three piece airlocks are designed to let gases out during fermentation. It's easy to pour, no need to aim, just pour it in slowly until the liquid reaches the line marks, and that's it. The airlock allows air to escape but not to enter.

Why We Like This:

Effective, and amazingly convenient for making your own wine at home
Must have for home wine or beer making
Lot of satisfied buyers

Best Runner up: Fermtech airtight carboy cap

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The latest fermtech airtight carboy cap is an absolute beast in terms of its features, and rightfully takes the top spot with ease. The carboy bungs are hard plastic and do not stay seated in the carboy. The other style has one chamber and a moving part inside. The bungs are a very tight fit on a 1 1/4" opening. The stopper could use more adhesive ability. These air locks work great. It fits good in half gallon juice containers.

Why We Like This:

Good investment for long term
New and hot release

Best For kombucha: Fermentology airtight carboy cap

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Not everyone likes to purchase cap for their daily purpose, but the fermentology airtight carboy cap would be an anomoly. These are excellent products for fermentation which work with Mason jars of any size with wide mouths. The inner chambers of the fermentology sauer system are strategically designed to effectively block air and vent gas so you don’t need to worry about your prep going to waste. The sauer system uses a water barrier hosted in an inner airlock chamber to effectively burp lacto ferments through an automatic degassing process that creates an anaerobic environment.

All you need is 4 wide mouth mason jars in addition to this kit to get started making sourdough bread, kimchi, pickles etc. The lid is quite big with a small indent so that would catch a little bit of liquid. When the ferment is complete, you’ll have tangy, sour and probiotic nourished vegetables that are a great source of vitamins. It is an easy diy pickle method and makes fermenting and pickling a breeze.

Why We Like This:

Attaches to any wide mouth mason jar, and very intuitive to use
Airlock and cover are dishwater safe
Made to fit wide mouth mason jars

Best For Brewing or water purification Set UPS: Aieve airtight carboy cap

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We would, of course, be remiss if we didn't mention aieve airtight carboy cap for daily purpose. Dispensing bottles have a different neck than standard glass carboys. They make an excellent seal and are easy to clean. They are made to fit on the top of large glass carboys with an opening approximately 2" across the rim. The orange carboy cap for airlocks for fermenting fits tightly around the carboy mouth, and the two openings of fermentation lids are convenient for attaching or inserting tubes, airlocks, siphons, or racking canes.

These carboy caps can be used either as a cap or as a fermentation locks for the carboy glass bottles. It is great for brewing or water purification set ups. It fits 5 gal glass carboys and 5 gal plastic water bottles as well.

Why We Like This:

Fit snugly on carboyeasy access port for syphon
Feels quite sturdy and fits the water gallon perfectly
Great cap for 3 and 5 gallon carboys

Best PREMIUM: Fermentaholics airtight carboy cap

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Not everyone likes to purchase cap for their daily purpose, but the fermentaholics airtight carboy cap would be an anomoly. These reusable lids are perfect for cold brew beer, ice tea, fermentations, homemade brew coffee, beverages, ciders, chemicals, solvents, and more. These are sure to help you brew successfully, whether brewing kombucha, kefir, beer, kvass, soda, cider, mead, wine, infused oils, and infused vinegars. It is a beautiful partner to fresh fruit like strawberries and fresh citrus.

The black screw cap has a lifted groove near the edges, making it easier to create a tight seal. The airtight caps ensure maximum carbonation build-up and flavor development by creating an airtight seal at the opening of your bottle.

Why We Like This:

Add delightfully tart and floral flavors to any of your favorite fermented beverages
Food grade and durable plastic lids for bottling your homebrews
Equipped with a polypropylene conical liner to provide a tight seal