The 10 Best glass carboy caps (2023 reviews)

We consider a glass carboy cap to be a worthy investment in the long run. We are here to help you choose the right one for your needs from all the best available products in market today.

Our review process: Show/Hide

Our Top Picks:

Best overall: Buy: Masontops glass carboy cap READ REVIEW

Best For mead: Buy: Fermtech glass carboy cap READ REVIEW

Best For kombucha: Buy: Fermentology glass carboy cap READ REVIEW

Best For Wine bottle: Buy: box Brew kits glass carboy cap READ REVIEW

Best For fermenter lid: Buy: ONEBOM glass carboy cap READ REVIEW

Best For intended purpose: Buy: Fastrack glass carboy cap READ REVIEW

Best For Brewing or water purification Set UPS: Buy: Aieve glass carboy cap READ REVIEW

Best For primary And secondary Fermentation of Beer: Buy: Vintage shop glass carboy cap READ REVIEW

Best For small test batches: Buy: Kchex glass carboy cap READ REVIEW

Best value For money: Buy: Guzeus glass carboy cap READ REVIEW

Best overall: Masontops glass carboy cap

Buy on Amazon

The masontops glass carboy cap is long-lasting, rigid and fits well with your regular usage like a dream. It is easy to make fermented vegetables. These silicone ferment lids are durable, easy to clean and hold really well under pressure while still allowing the ferment to off-gass. It makes it so easy to ferment without spilling over or burping the jars often. The set of wide mouth mason jar pickle pipes comes in four attractive colors (red, teal, purple and blue) so you can keep track of similar ferments easily.

These fermentation toppers are 3.3 inches in diameter and precisely fit wide mouth mason jars. There are wide mouth and standard size bands for the matching sized mason jar. It will work on standard size canning jars.

• Works on regular and wide mouth jars
• Silicone, fits well on jars, keeps air out, as it should
• Easy to use, worked well for fermenting veggies
• Perfect fit for regular mouth mason jars

Best For mead: Fermtech glass carboy cap

Buy on Amazon

The fermtech glass carboy cap gives the top-tier cap a run for their money by offering flagship specs at a much more affordable price. It comes with the introduction of home mini 2 and pro super colombo machines. These are meant for glass jugs. The stopper could use more adhesive ability. These are plastic but rugged and work. The airlock and bung set is a mixed bag. These are perfect for home brewing. These are thin and break easily. It is definitely a must-have item with winemaking.

• Simple and easy and as self explanatory as you can get
• Works great, and kinda fun to see it bubble
• You don't have to worry about dropping and breaking them

Best For kombucha: Fermentology glass carboy cap

Buy on Amazon

The fermentology glass carboy cap gives the top-tier cap a run for their money by offering flagship specs at a much more affordable price. The fermentology sauer system uses water to create an oxygen barrier that handles burping bubbling ferments automatically so you don’t have to. It includes 1x airlock, 1x tough top lid (includes silicone gasket and grommet), and a silicone stopper. When the ferment is complete, you’ll have tangy, sour and probiotic nourished vegetables that are a great source of vitamins. The lids are good and even come with plugs for when you move to the fridge.

It is fermented, it not only takes on a pleasantly sour and tangy taste and becomes naturally preserved, but it also maintains it’s original nutrients with the addition of probiotics. There are 2 silicone seals, the small one in the center of the lid and 1 under the lid that seals to the jar.

• Surprisingly simple way to convert wide mouth canning jars into fermenting flasks
• Great for your at-home fermentation station
• Easy and keeps in the odours
• Excellent size for small batches of fermentation items

Best For Wine bottle: box Brew kits glass carboy cap

Buy on Amazon

Box Brew Kits offers a variety of cap for personal choice and yet maintaining quality in all the variants. It is perfect for home brewing beer, making wine, kombucha, or any type of fermentation. The three piece airlock has a water fill. The main body is about 1.5" wide by 3" tall and the stem is roughly 1/2" by 1. The airlock by itself is 4 3/4 inches high. It's a good fit and it does it's job well. The center piece will fall out so be careful when sanitizing or losing one to the sink drain. The airlocks are great. It is great for home brewing in gallon jugs.

• Held sanitizing solution for a month without needing to refill
• Super handy, comes with nice rubber corks and is a solid product
• Very nice to have rubber stoppers included, and a exceptional value

Best For fermenter lid: ONEBOM glass carboy cap

Buy on Amazon

Onebom is known for creating pragmatic and minimalist cap for people on the go, and its line of onebom glass carboy cap definitely falls in line with that reputation. These airlocks are perfect. They work well for home winemaking. With these and a vacuum pump, you might not need to skim mold and yeast from the surface of the brine, otherwise they make no difference in the length of fermentation, storage, or how fast you eat it. The grommets insert easily into a 1/2" drilled hole and once the airlock is placed in the grommet there is no co2 leaking from around the grommet or where the airlock enters the grommet. It can also work for fermenting vegetables like ferment cabbage to make sauerkraut. The design is very good.

• You can see clearly when you ferment vegetables or beer
• Very nice plastic feel to them too
• Keep the dust or insects out
• Solid plastic, transparent body easy to see the fermentation process

Best For intended purpose: Fastrack glass carboy cap

Buy on Amazon

We would, of course, be remiss if we didn't mention fastrack glass carboy cap for daily purpose. These airlocks and stoppers from The Vintage Shop are just great for anything that you want to ferment. It fits a one gallon carbon perfectly. There is a fill line on the actual airlock. It can make a blowoff valve too but using some tubing in the stem which is cool. The topper keeps your wine from exploding all over.

These are designed to go on a fermentation unit to allow sanitary outgassing. It is easy to clean, easy to use, has a nice fill line for the water and they're fun to watch.

• Cracks, dishwasher safe and the holes are centered in the corks
• You can definitely suck water through it
• Worked perfectly for one gallon jugs, made 3 gallons of wine, worked perfectly

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

Buy on Amazon

Compared with other cap in this category, the aieve glass carboy cap has a convenient design. Dispensing bottles have a different neck than standard glass carboys. They are made to fit on the top of large glass carboys with an opening approximately 2" across the rim. It fits 5 gal glass carboys and 5 gal plastic water bottles as well. 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 is suitable for 3/5/6 gallon glass carboy, and can be used as the fermentation airlock auxiliary tools for fermentation of wine, beer, and food.

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

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

Buy on Amazon

The vintage shop glass carboy cap is satisfactory and appropriate and fits well with your regular usage. It is used to start a siphon without a special siphon device without a hand pump too. Even if you can get the cork to "fit, " during fermentation it regularly works its way out of the carboy, onto the floor. It does fit 5&6 gallon carboys. It provides a durable tight fit and holds well.

The shaped airlock is always even, while other carboys with airlock and bung changes levels as pressure rises and drops due to slight temperature fluctuations over the course of the day. This cap is used to start a siphon without a special siphon device or hand pump too. This really reduces air exposure of the wine.

• Works and is pliant, easy to fit on the carboys
• Nice and snug no leakage or seeping of air
• One of the new comers and featured product

Best For small test batches: Kchex glass carboy cap

Buy on Amazon

Best part: kchex glass carboy cap costs comparatively low and it is available to ship in 24 hours. They screw on a standard carboy nice and tight. It fits well to the jug, screwing on easily. It will hold up through more uses than the last ones. It is great for small test batches. It is perfectly fits 1 gallon wine glass jars for use as fermenters.

• Nice thick plastic and easy to wash as and re-use
• Great fit for 1 gallon glass carboy
• Working very well to keep the airlock seated in the one gallon glass carboy

Best value For money: Guzeus glass carboy cap

Buy on Amazon

The guzeus glass carboy cap should be able to handle its purpose and duties with ease. It allows fermentation without something spoiling your bread starter. 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 food-grade materials. The airlocks fit nicely into the grommets or bungs.

The airlocks are three parts and you can easily remove the cover to facilitate the cleaning. It can be used for various fermentation projects to preserve food. It is perfectly in 1 gallon glass jugs. These are a little difficult to clean if anything gets into the curves but a straw cleaner does nicely to remedy that.

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