Fermentation Airlock, Stopper & Accessories

Universal stoppers have a longer taper to help produce a better fit and a snug seal, and a lip which prevents them from falling into your container. Available with a 3/8 inch hole for an airlock, or solid with no hole. #10 size is recommended for PET carboys.

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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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A great carboy hood for a real snug fit. Fits our 3, 5, and 6 gallon glass carboys. Will also fit over our 5 and 6 gallon plastic carboys. Ideal to use if you have a real active fermentation. Add 3' of 1/2" racking tubing to your 3-piece airlock. Take out the bubbler piece to assemble into a blow-off setup.

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An oversized airlock, designed to keep your barrels safe. This will fit bung holes w/ openings from 1.5 - 2 in.  

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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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#12 natural latex rubber stopper with 3/8 inch hole. To create a solid stopper, simply use a #000 solid stopper (FE400) to plug the hole. Top diameter 64 mm, bottom diameter 54 mm, length 27 mm

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Size 1 1/2" - 1 13/16"

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Effortless Bung Removal: The ridge design ensures easy and hassle-free removal of the bung, simplifying barrel management. Effective Airlock System: Acts as an airlock, allowing CO2 to escape while keeping oxygen out, making it perfect for fermentation processes. Versatile Fit: Compatible with 30- and 60-gallon barrels, Variable Volume tanks, and 2" tri-clamp ferrules, offering flexibility across various setups. Multi-Size Replacement: Replaces stopper sizes #10, #11, and #12, with precise measurements for a perfect fit and easy assembly. We recently discovered this premium breathable silicone barrel bung and were immediately impressed with its robust design and features. To start with, the ridge really helps make bung removal effortless. The bung acts as an airlock and allows the release of CO2 while maintaining a seal against oxygen coming in. This makes the bung ideal for alcoholic or malolactic fermentation in barrels or tanks.  Fits 30- and 60-gallon barrels as well as the hole in the lid of most Variable Volume tanks! Also fits perfectly in a 2" tri-clamp ferrule Replaces Stopper Sizes #10 , #11, #12 Stopper Measurements: 1.65" x 2.19" (42 mm x 55.5 mm) The flapper stopper protrudes roughly 2.5" from the stopper to allow for easy assembly Other available sizes include the Breathable Carboy Bung and the Universal Breathable Bung. All three size options can be purchased in one complete bundle with the Breather Bung Pack.  

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#7.5 stopper - with 3/8 inch hole. Top diameter 1.5 inches (39 mm), bottom diameter 1.22 inches (31 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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Buon Vino stoppers have a longer taper to help produce a better fit and a snug seal, and a lip which prevents them from falling into your container. Available with a 3/8 inch hole for an airlock, or solid with no hole. #8-9 (medium) size is recommended for medium size barrels and 9 gallon demijohns.

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#11 stopper - solid. Top diameter 2.17 inches (55 mm), bottom diameter 1.89 inches (48 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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Universal stoppers have a longer taper to help produce a better fit and a snug seal, and a lip which prevents them from falling into your container. Available with a 3/8 inch hole for an airlock, or solid with no hole. #11-11.5 (large) size is recommended for full size barrels and 14 gallon demijohns.

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Secure Fit: Designed with a ridge and gentle taper to prevent slipping or being sucked in, ensuring a reliable seal during use. Self-Sealing Vent: Equipped with vent holes that allow air to escape but prevent it from entering the fermenter. Easy Maintenance: Simple to clean and sanitize, making it highly convenient for repeated use. Replaces stopper sizes #8 and #9 This CellarScience Bung has a ridge to keep it from getting sucked in and self-sealing vent holes to let air out but not in. They have a gentle taper, so they don’t slip out during use.  They are also very easy to clean and sanitize. Replaces Stopper Sizes #8, #9 Stopper Measurements: 1.36" x 1.89" (34.5 mm x 48 mm) The flapper stopper protrudes roughly 2.5" from the stopper to allow for easy assembly Other available sizes include the Breathable Carboy 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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Please note: This hood 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 silicone 3-hole carboy hood is used alongside the BrewBuilt CoolStix. The holes are for a 1/2" CoolStix, an airlock and a carboy thermowell. The holes measure 0.500", 0.413", & 0.375" Compatible with smooth neck carboys only. Does not fit Italian threaded neck carboys.

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Rubber stopper for use with the MT140 Economy Aeration-Oxidation System. Top Outside Diameter (OD) 27mm Bottom Outside Diameter (OD) 23mm Height 25mm  

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#8 stopper - solid. Top diameter 1.59 inches (40.5 mm), bottom diameter 1.31 inches (33 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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#13 stopper - with 3/8 inch hole. Top diameter 2.64 inches (67 mm), bottom diameter 2.28 inches (58 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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#7.5 stopper - solid. Top diameter 1.5 inches (39 mm), bottom diameter 1.22 inches (31 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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#11 1/2 natural latex rubber stopper with 3/8 inch hole. Top diameter 63 mm, bottom diameter 50 mm, length 25 mm. 6 stoppers per pound.

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#12 natural latex rubber stopper - solid. Top diameter 64 mm, bottom diameter 54 mm, length 25 mm. 6 stoppers per pound.

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Expansion stopper for sealing beer, wine, and other narrow neck bottles. Simply insert the expansion stopper into the neck of the bottle, press the lever down, and the bottle will hold carbonation and liquids inside. Great for saving a partial bottle of beer or wine while keeping a good seal on the bottle.

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Universal stoppers have a longer taper to help produce a better fit and a snug seal, and a lip which prevents them from falling into your container. Available with a 3/8 inch hole for an airlock, or solid with no hole. #11-11.5 (large) size is recommended for full size barrels and 14 gallon demijohns.

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Designed to fit 3 to 6.5-gallon glass carboys and 500ml flasks, making it ideal for a variety of storage needs. Ribbed body and ridge prevent slipping or being sucked in, ensuring a reliable seal during long-term storage. Despite its ribbed design, this silicone bung is easy to clean and sanitize for hassle-free use. Solid Silicone bung that will fit a 3, 5, 6 or 6.5 gallon glass carboy or 500ml flask. A solid stopper is the most reliable way to keep oxygen out for long term storage. This bung has a ridge to keep it from getting sucked in when temperatures cool. It also features a ribbed body it doesn't slip out during use. Even though it isn't perfectly smooth like some other stoppers, it remains easy to clean and sanitize. The top measures 1.5" wide and the bottom is 1.13" wide. While the FE592 carboy stopper is a great, economical choice, you may also want to check out our premium, silicone carboy hood FE496 as well. Working as both a solid or a breathable bung (depending on how the plug is set), the FE496 is like getting two bungs in one!

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Buon Vino stoppers have a longer taper to help produce a better fit and a snug seal, and a lip which prevents them from falling into your container. Available with a 3/8 inch hole for an airlock, or solid with no hole. #8-9 (medium) size is recommended for medium size barrels and 9 gallon demijohns. 1 13/16''- 1 7/16''

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#8.5 stopper - solid. Top diameter 1.66 inches (43 mm), bottom diameter 1.43 inches (36 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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Large plastic airlock for stainless steel variable capacity tanks, or other containers with a thin lid. Features a threaded shaft with back nut and washer. Threaded shaft & locking ring: 1.75" diameter Overall Length: 11" Airlock Length Above Lid: 9"

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#13 stopper - solid. Top diameter 2.64 inches (67 mm), bottom diameter 2.28 inches (58 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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