Stoppers, Bungs & Airlocks

Airlocks are another one of those necessary pieces of equipment for every homebrewer.  If you ferment in a carboy or bucket this 3 piece airlock is a must! It’s a popular alternative to the triple ripple type of airlock because it can be taken apart and cleaned, and is easy to fill. (However we do sell the triple ripple type (FE371) in case you are used to that type and would like to stay with it.)    While a simple device not all airlocks are the same. Some other designs have only a couple holes in the plastic lid and this can cause the airlock to pop out during an active fermentation.  Our design features multiple holes that allow CO2 to escape easily.  Additionally some other airlocks have a cross hatch design on the bottom. We have found this more easily leads to Krausen clogs and the airlock being pushed out of the fermenter. Ours is open, allowing Krausen foam to enter the airlock if necesary.  Better to clean your airlock out than to find it laying on the floor next to your fermenter 3 days later.     Another cool feature of this 3-piece airlock is that 1/2" ID Silicone tubing will fit onto the center post for use as a blowoff. In the cases where you are using a yeast known to produce lots of Krausen (wlp002 from White Labs or 1968 from Wyeast for example) remove the top cover, remove the plastic 'hat', and install the silicone tubing.  Run the silicone tubing into a jar or bucket of water. When fermentation dies back down remove the tubing and replace the hat and cover.   Please Note: Airlock only - stopper not included.

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S-shaped airlocks are the "OG" airlocks for home beer and winemaking. They make it easy to spot fermentation activity, and have no loose peices to lose. The advantage of this type of airlock is that they have a smaller chamber so you can more closely observe the CO2 rising and therefore the rate of fermentation. They are also handy when you are cooling a beer as there is less chance of sucking airlock water back into the fermentation. They cannot be cleaned manually if they get dirty during the ferment. That is why many homebrewers prefer 3-piece airlocks for the active portion of the ferment, when the krausen (foam) from fermentation might be pushed up into the airlock. Please Note: Stopper Not Included. 

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#7 stopper - with 3/8 inch hole. Top diameter 1.43 inches (36.3 mm), bottom diameter 1.19 inches (30 mm), length 1 inch (25 mm). BPA-free stopper made of food grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet. To create a solid stopper, simply use a #000 solid stopper (FE400) to plug the hole. Max. Temperature Rating: 158 °F (70 °C).

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You will love the versatility of this stopper!   The Universal Stopper with Hole fits a 2.8, 3, 5, 6, or 6.5 gallon glass carboy. Also fits our 500ml Erlenmeyer flask, and can be flipped over and used in most bottles! Made with a longer taper from a different material from standard stoppers to minimize popping out when wet.   Please Note: This stopper will not fit in plastic carboys, Better Bottles or Speidel Plastic Fermenters.

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Due to high demand, the case of 100 is currently out of stock. Be the first to receive your items by placing a pre-order today. We will automatically ship this to you when we receive more inventory.   Use this foam stopper with your Erelenmeyer flask when making a yeast starter. Aeration is an important aspect of making a strong, healthy starter. This is why we recommend using a stir plate, which provides continuous aeration. This foam stopper will allow air to flow freely into your flask while keeping pesky bugs and other contaminants out. A quick spray down with sanitizer is all you need. Suitable for flasks or other vessels with an inner diameter opening of 35-45mm (1-3/8" - 1-3/4"). Reusable Resists alcohols, bases, esters, and dilute acids Autoclavable up to 249°F (121°C).

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#10 stopper - with 3/8 inch hole. Top diameter 2 inches (51 mm), bottom diameter 1.66 inches (43 mm), length 1.10 inch (28 mm). BPA-free stopper made of food grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet. To create a solid stopper, simply use a #000 solid stopper (FE400) to plug the hole. Max. Temperature Rating: 158 °F (70 °C).  

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Size 15/16" - 1 1/16" To create a solid stopper, simply use a #000 solid stopper (FE400) to plug the hole.

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#6 stopper - with 3/8 inch hole. Top diameter 1.25 inches (32 mm), bottom diameter 1.03 inches (26 mm), length 1 inch (25 mm). BPA-free stopper made of food grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet. For use with our 1 gallon glass jars (FE300). To create a solid stopper, simply use a #000 solid stopper (FE400) to plug the hole. Max. Temperature Rating: 158 °F (70 °C).

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This stopper has two holes and we use it in the production of our #10 stopper thermowell. It features one 3/8" hole and one 1/4" hole. A racking tube or stainless tube can be inserted into the 1/4" hole with the aid of some lubrifilm, forming an airtight seal, and the 3/8" hole fits an airlock. Even after you wedge all these fittings into it, it still fits a plastic carboy neck! Use this in any configuration you can think of, it'll fit: Airlocks, Thermowells, Racking Canes, and anything else you can imagine!

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Stopper #2 - with 3/8 inch hole. Top diameter 0.83 inches (21 mm), bottom diameter 0.63 inches (15.8 mm), length 1 inch (25 mm). BPA-free stopper made of food grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet. To create a solid stopper, simply use a #000 solid stopper (FE400) to plug the hole. Max. Temperature Rating: 158 °F (70 °C).

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Pick up two airlock and stopper combos for a lower price! Includes two S-Shaped airlocks and two Universal Stoppers. Fits a 2.8, 3, 5, 6, or 6.5 gallon glass carboy, as well as 500ml Erlenmeyer flask. Please Note: This stopper will not fit in plastic carboys, Better Bottles or Speidel Plastic Fermenters.  

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This oversized 3-piece airlock can hold 50% more water or sanitizer so your airlock is less likely to evaporate dry or get sucked dry. When the temperature drops, your fermenter will suck in solution from the airlock, and if the temperature drop is significant the airlock can be completely emptied. An empty airlock opens the door for airborne spoilants to make their way into your fermenter unchecked. The extra large 3-piece airlock offers your fermenter even more protection, and is especially useful when cold crashing.   While a simple device not all airlocks are the same. Some other designs have only a couple holes in the plastic lid and this can cause the airlock to pop out during an active fermentation.  Just like our normally sized airlock, our design features many holes in the lid that allow CO2 to escape easily.  Additionally some other airlocks have a cross hatch design on the bottom while our is open to allow Krausen foam to enter the airlock if necesary.  Better to clean your airlock out than to find it laying on the floor next to your fermenter 3 days later.     Another cool feature of this 3-piece airlock is that 1/2" ID tubing will fit onto the center post for use as a blowoff.  This can be handy if you have a really active ferment that is blowing out the top of your fermenter.     Please Note: Airlock only - stopper not included.

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#3 stopper - with 3/8 inch hole. Top diameter 0.95 inches (24 mm), bottom diameter 0.71 inches (18 mm), length 1 inch (25 mm). BPA-free stopper made of food grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet. To create a solid stopper, simply use a #000 solid stopper (FE400) to plug the hole. Max. Temperature Rating: 158 °F (70 °C).

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Plug the hole in other stoppers when moving or shaking the fermenter.

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#6.5 stopper - with 3/8 inch hole. Top diameter 1.34 inches (34 mm), bottom diameter 1.06 inches (27 mm), length 1 inch (25 mm). BPA-free stopper made of food grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet. To create a solid stopper, simply use a #000 solid stopper (FE400) to plug the hole. Max. Temperature Rating: 158 °F (70 °C).

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Solid version of FE494. A new stopper that fits a 2.8,3,5,6, or 6.5 gallon glass carboy. (DOES NOT FIT BETTER BOTTLE OR PLASTIC CARBOYS) Also fits a 500ml Erlenmyer flask. Made with a longer taper from a different material, this stopper does not pop out when wet. Much more reliable, it quickly became our stopper of choice for all applications involving these size carboys.

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This stopper has two holes and we use it in the production of our #6.5 stopper thermowell. It features one 3/8" hole and one 1/4" hole. A racking tube or stainless tube can be inserted into the 1/4" hole with the aid of some lubrifilm, forming an airtight seal, and the 3/8" hole fits an airlock. Even after you wedge all this junk into it, it still fits a carboy neck! Also fits perfectly into a 1.5" tri-clamp ferrule, and the stopper's flange will ensure it doesn't fall in. Use this in any configuration you can think of, it'll fit: Airlocks, Thermowells, Racking Canes, and anything else you can imagine!

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Our mini and medium 2-piece airlocks are a great option when a single inch could make or break fitting your carboy into a fermentation chamber. The airlock breaks down into 2-pieces for easy cleaning. Instead of a floating center piece, like standard 3-piece airlocks, the center piece is molded into the lid. One less piece to clean and misplace! Another cool feature of this 2-piece airlock is that 1/2" ID tubing will fit onto the center post for use as a blowoff.  This can be handy if you have a really active ferment that is blowing out the top of your fermenter. Holds approximately 0.4 fl oz (12 ml) Chamber - 1-1/2" tall x 1-3/8" diameter Stem - 1" long Stopper not included

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#10 stopper - solid. Top diameter 2 inches (51 mm), bottom diameter 1.66 inches (43 mm), length 1.10 inch (28 mm). BPA-free stopper made of food grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet. Max. Temperature Rating: 158 °F (70 °C).

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#7 stopper - solid. Top diameter 1.43 inches (36.3 mm), bottom diameter 1.19 inches (30 mm), length 1 inch (25 mm). BPA-free stopper made of food grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet. Max. Temperature Rating: 158 °F (70 °C).

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Dual Functionality: Acts as both a stopper and an airlock, allowing CO2 to escape while preventing oxygen and contaminants from entering, ensuring optimal fermentation conditions. Versatile Fit: Compatible with a wide range of containers, including 3, 5, 6, and 6.5-gallon carboys, 1-gallon bottles, growlers, and 500 mL flasks, replacing multiple stopper sizes. Ideal for Wine and Beer Ferments: Breathable stoppers are a popular choice in commercial wineries and perfect for beer fermentation, it creates a vacuum if the wort cools, preventing contamination from water airlocks. A breathable Silicone stopper that acts as both a stopper and an airlock. Unique design allows CO2 pressure to escape but keeps Oxygen and airborne contamination out. This quickly became our stopper of choice for wine, and is a popular style used by numerous commercial wineries. Also has great application for beer ferments: It will create a vacuum if fermenting wort cools (as opposed to pulling water in from your traditional airlock.) Airtight seal is great for extended fermented lager when CO2 production is still present but very slight.  Fits 3, 5, 6 & 6.5 gallon glass carboys, 1 gallon bottles, growlers, and 500 mL flasks. Replaces Stopper Sizes #6, #6.5, #7, #8 Stopper Measurements: 0.94" x 1.48" (24 mm x 37.5 mm) The flapper stopper protrudes roughly 2.5" from the stopper to allow for easy assembly Other available sizes include the Universal Breathable Bung and the Breathable Barrel Bung. All three size options can be purchased in one complete bundle with the Breather Bung Pack.  

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This is a replacement stopper for our Counter Pressure Bottle Fillers.  This will work with both KEG801 & KEG804.  Stopper - #2.5 with 3/8" hole.

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#6 stopper - solid. Top diameter 1.25 inches (32 mm), bottom diameter 1.03 inches (26 mm), length 1 inch (25 mm). BPA-free stopper made of food grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet. Max. Temperature Rating: 158 °F (70 °C).

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Wooden Keg Bung. 1 27/32".    

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Size 1 1/2" - 1 13/16" To create a solid stopper, simply use a #000 solid stopper (FE400) to plug the hole.

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#2 stopper - solid. Top diameter 0.83 inches (21 mm), bottom diameter 0.63 inches (15.8 mm), length 1 inch (25 mm). BPA-free stopper made of food grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet.  Max. Temperature Rating: 158 °F (70 °C).

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#5 1/2 natural latex rubber stopper with 3/8 inch hole. Also called a size 5.5.   Size: 0.94 - 1.1 inches To create a solid stopper, simply use a #000 solid stopper (FE400) to plug the hole.

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Our mini and medium 2-piece airlocks are a great option when a single inch could make or break fitting your carboy into a fermentation chamber. The airlock breaks down into 2-pieces for easy cleaning. Instead of a floating center piece, like standard 3-piece airlocks, the center piece is molded into the lid. One less piece to clean and misplace! Another cool feature of this 2-piece airlock is that 1/2" ID tubing will fit onto the center post for use as a blowoff.  This can be handy if you have a really active ferment that is blowing out the top of your fermenter. Holds approximately 0.67 fl oz (20 ml) Chamber - 1-5/8" tall x 1-3/4" diameter Stem - 1-1/4" long Stopper not included

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Please note: This stopper was designed for use with the BrewBuilt CoolStix which has been discontinued. Two of the holes are for an airlock and thermowell, but the third 1/2" hole was intended for the CoolStix and you will need to plug it or utilize it how you see fit. This #10 3-hole silicone stopper is used alongside the BrewBuilt CoolStix for Carboys. The holes are for a 1/2" CoolStix, an airlock, and a thermowell. The holes measure 0.500", 0.413", & 0.375" Compatible with Fermonsters and our Plastic PET Carboys listed below under "You Might Also Need".

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#9.5 stopper - with 3/8 inch hole. Top diameter 1.8 inches (46 mm), bottom diameter 1.5 inches (38 mm), length 1 inch (25 mm). BPA-free stopper made of food grade materials. Injection molded TPE for superior consistency throughout. Perfect for use with carboys, as the material sticks well to glass and PET, even when wet. To create a solid stopper, simply use a #000 solid stopper (FE400) to plug the hole. Max. Temperature Rating: 158 °F (70 °C).

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#2 natural latex rubber stopper - solid. Top diameter 20 mm, bottom diameter 16 mm, length 25 mm. 67 stoppers per pound.

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