The 8 Best carboy caps (2023 reviews)

Here, we present cap that manages to win our hearts. It's the fermentology carboy cap and it's widely considered as one of all-around great cap you can buy. These silicone carboy caps are excellent, easy to use and provide a tight seal, they stretch and seal around the carboy opening. 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. The airlocks are well designed,and the stopper plug for refrigerated storage without changing lids, completes the airlock system.

There are 2 silicone seals, the small one in the center of the lid and 1 under the lid that seals to the jar. The airlock lid prevents air from getting in while allowing the gasses to seep out. When the ferment is complete, you’ll have tangy, sour and probiotic nourished vegetables that are a great source of vitamins. It is perfect for fermenting in because of their convenient size and popularity.

Why We Like This:

Excellent size for small batches of fermentation items
A modern and effective take on cork/hard silicone bungs
Fits jars well and easy to use and clean
Great for fermenting vegetables or making hooch

Best For fermenter lid: ONEBOM carboy cap

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We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate cap. The onebom carboy cap is exactly that - it's a simple cap that hits all the right notes. These air locks are used on fermentation carboys to release CO2 without allowing air to enter the carboy. The supplied dust caps for the tops of airlocks have no breather holes. It does not suck liquid back into your brew when cold crashing. The tail of the airlock will not break when inserted into the bottle mouth.

The advantage of this red cap is that you don't need to drill holes on it. It is easy to observe the gas of ferment. This bubble lock is a perfect choice. It is a very pleasant shopping experience.

Why We Like This:

You can see clearly when you ferment vegetables or beer
Keep the dust or insects out
Cover the lid to prevent the fruit flies from falling
Solid plastic, transparent body easy to see the fermentation process

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

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Not everyone likes to purchase cap for their regular usage, but the aieve carboy cap would be an anomoly. If you have a carboy for wine or beer, you need this air lock. It is compatible with ninja dual brew pro coffee maker. These carboy caps can be used either as a cap or as a fermentation locks for the carboy glass bottles. 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. It is suitable for 3/5/6 gallon glass carboy, can be used as the fermentation airlock auxiliary tools for fermentation of wine, beer, and food. It is great for brewing or water purification set ups.

Why We Like This:

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

Best For mead: Guzeus carboy cap

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The guzeus carboy cap is satisfactory and appropriate and fits well with your daily purpose. You can easily see the entire fermentation process, they can last for a long time, because they are the top fda transparent airlock. It is made of mavi tree bark tea, water and sugar. The clear plastic makes it easy to see the water level and whether there is any blockage during fermentation.

The airlocks fit nicely into the grommets or bungs. The airlock is completely open to contaminants. It comes with the promised air locks. These are a little difficult to clean if anything gets into the curves but a straw cleaner does nicely to remedy that. It is perfectly in 1 gallon glass jugs.

Why We Like This:

Great for bottles, jugs, or any container you can put a small hole in
Automatic exhaust at room temperature without manual control
Improve your emotional and mental health
Prevent obesity and diabetes, and regulate the absorption of dietary fat

Best For primary And secondary Fermentation of Beer: Vintage shop carboy cap

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Vintage Shop has been making great cap for years, thanks to a combination of clever design and appropriate materials. This product works great on both 5 and 6 gallon glass carboys. It is perfect for primary and secondary fermentation of beer. It fits tight on a standard 23l (5.5 gallon) glass carboy. A siphon tube on the small connection allows you to blow off without contamination. It can make a re-rack easier. This product is a universal carboy cap, and will fit. It is good for closed transfer rig.

Why We Like This:

Keeps a good seal on both 5 and 6 gallon carboys
Good investment for long term

Best For Mason jar: Zazolyne carboy cap

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Zazolyne line of cap come in a pretty wide variety of styles, so you can definitely find one that suits your individual preferences and needs. This new type of dust cap has a zigzag design on the surface and will not slide when opened. The bung plugs work great on 1 gallon and 1 1/2 gallon wine jugs and jugs. There are 3 buckles inside, press it down gently, you can close it with a snap, pull it up and rotate to open it. The lid does not need to be drilled as there is a gap around it, which allows the gas to escape.

The stoppers are very flexible and fit both 1Gal and 4L jugs. The wine is fermenting perfectly and no air is getting back in the jar. It works for intended use and also works well for ginger bug.

Why We Like This:

Works great takes effort to clean
Pre drilled screw on caps are better
One of the new comers and featured product

Best PREMIUM: Fermentaholics carboy cap

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The fermentaholics carboy cap is the best luxary cap on the market today. This is a beautiful partner to fresh fruit like strawberries and fresh citrus. These reusable lids are perfect for cold brew beer, ice tea, fermentations, homemade brew coffee, beverages, ciders, chemicals, solvents, and more. 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.

These are sure to help you brew successfully, whether brewing kombucha, kefir, beer, kvass, soda, cider, mead, wine, infused oils, and infused vinegars.

Why We Like This:

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

Best Easy To Clean: Zazolyne dust cap

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The zazolyne dust cap's superior materials makes sure that it ages well with use. If you are getting into home brewing, this six pack is a must have. This is a solid air lock set with grommets that are secure, fit snugly, and have a good taper to adjust to different bottle tops. There are 3 buckles inside, press it down gently, you can close it with a snap, pull it up and rotate to open it. It allows the gas to escape.

These bubble airlock sets are solid and reusable. It is easy to clean by keeping things from getting into the airlock. It is made of a high quality materials, and cleaned/dried well. These are just the right firmness to fit inside and stay in place. It is easy to use and a value for the money.

Why We Like This:

Improved cap easy on and off
Good investment for long term