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Fastrack Twin Bubble Airlock for Fermentation | Hydrolocks for Fermenting Wine and Beer Making | BPA-Free Cylinder Airlock used for Brewing Wine, Beer, Pickles & more | Transparent Airlock Set Of 2

4.6 4.6 out of 5 stars 13,333 ratings
$6.39 with 8 percent savings
Typical price: $6.95

This is determined using the 90-day median price paid by customers for the product on Amazon. We exclude prices paid by customers for the product during a limited time deal.
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Purchase options and add-ons

Material Plastic, Rubber
Color Clear/Tan
Brand Home Brew Ohio
Item Weight 27.22 g
Product Dimensions 3.15"L x 1.97"W
Is Customizable No

About this item

  • AUTOMATIC TRANSPARENT AIRLOCK: FastRack airlocks are stronger, more transparent, and made of food-grade materials. You will easily see the entire fermentation process! Due to the airtight design of our fermentation airlock we isolate the air and prevent oxidation. Fastrack brewing airlock exhausts automatically at room temperature without manual intervention.
  • EASY & SIMPLE TO USE: Insert the assembled airlock into the hole of the rubber stopper that fits your current jug or carboy. Fill the Bubbler Airlock with water and insert the drilled stopper or bung to vent gasses during fermentation. The airlock cap should always stay on top when in use to allow gas to escape and prevent the water inside from quickly spilling out if tipped over.
  • HOW IT WORKS: Airlocks enable CO2 to be released during fermentation and trap oxygen from entering the fermenter. The bubbler style airlock is the preferred airlock for secondary fermentation, as it is possible to monitor the pressure inside the fermenter, and is the go to winemaking airlock.
  • WIDELY USED: The fermentation airlock can be used in various fermentation projects to preserve food as well! The brewing airlock can be used to brew craft beer or wine, but also used for sauerkraut, kimchi, etc.
  • SATISFACTION GUARANTEE: At FastRack we pride ourselves on creating products that can be trusted by our customers. Buyer satisfaction is our top priority, maybe, sometimes accidents happen during shipping. If anything is cracked or broken, please let us know and we’ll do our best to make sure you are 100% satisfied with our product and service.

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 3.15 x 1.97 x 3.15 inches; 0.96 ounces
  • Item model number ‏ : ‎ B00A6TRKO4
  • Date First Available ‏ : ‎ November 13, 2012
  • Manufacturer ‏ : ‎ Fermtech
  • ASIN ‏ : ‎ B00A6TRKO4
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.6 4.6 out of 5 stars 13,333 ratings

WARNING:

CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Product Description

AUTOMATIC TRANSPARENT AIRLOCK: FastRack airlocks are stronger, more transparent, and made of food-grade materials. You will easily see the entire fermentation process! Due to the airtight design of our fermentation airlock we isolate the air and prevent oxidation. Fastrack brewing airlock exhausts automatically at room temperature without manual intervention.

From the brand

From the manufacturer

What's in the box

  • Airlock and Stopper (Pack of 2)

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    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    13,333 global ratings

    Customers say

    Customers like the quality, value, and airlock of the bottle opener. They mention that it works great, is easy to use, and is good value for money. Some complain about the fit, saying that the bungs are one size too big. Opinions are mixed on ease of cleaning.

    AI-generated from the text of customer reviews

    755 customers mention563 positive192 negative

    Customers like the quality of the bottle opener. They say it works great, is easy to use, and works perfectly for their small homebrew. They also say the step drill works great and the bubblers work as expected. Customers also mention that the design is solid and it lasted them years.

    "...It may have been closer to 9/16ths. Step dril works great for this as you can size it up slowly to test your fit, and the step shoulders de-burr the..." Read more

    "Works great with my 3gal / 5 gal / 6 gal carboys. However does not get narrow enough for the 1 gal size carboy (which is fine to me)." Read more

    "I bought these as backup airlocks and spares. They work GREAT, but if your ferment is going really strong, they will still pop out..." Read more

    "...My rating is based off the quality. They are incredibly thin plastic - 1 individual piece arrived broken out of the 8 pieces I bought...." Read more

    199 customers mention174 positive25 negative

    Customers like the value of the bottle opener. They say it's easy to use, inexpensive to replace, and good value for money.

    "...Overall, pretty decent for the price. I wouldn't recommend to others, but that's personal preference - not because it's a bad product...." Read more

    "They work exactly as they are supposed to , excellent product for the money." Read more

    "The product held up it was Stout arrived on time and price was good" Read more

    "Good price, used it to make wine. Worked very well" Read more

    121 customers mention105 positive16 negative

    Customers like the airlock. They say it works just like you'd expect, is functional, and is a simple device. Some mention that the air lock is much easier using than risking the wine tasting.

    "...Air lock is a simple device that works great." Read more

    "These work for air lock. It's funny I think these actually have the stopper going to where it keeps pressed in" Read more

    "These airlocks work perfectly." Read more

    "...The airlocks work great also. I've got 3 jugs of juice wine bubbling away as I type. Great product. I'll buy again." Read more

    106 customers mention85 positive21 negative

    Customers find the bottle opener easy to use. They mention it's simple to fabricate, install, and use the airlock. Some say the product is great for beginners and easy to clean and operate.

    "...It was super easy. Just had to buy the right grommet and drill a hole.Some measurements as I thought it may help others:..." Read more

    "...I need a slightly larger stopper, but this was easy enough to fabricate and use the airlock" Read more

    "...time using air locks for wine making and I am impressed by how easy they are to use...." Read more

    "Very easy to use and worked perfectly for my small homebrew." Read more

    69 customers mention41 positive28 negative

    Customers are mixed about the ease of cleaning. Some mention that it's super easy to clean and sanitize, while others say it'll be a little harder to clean than the other type.

    "...They cleaned up easily and did the job as intended. Easily recommended item." Read more

    "...On top of that, cleaning these is mildly annoying - not too bad though...." Read more

    "Harder plastic stopper, works great. Fits into bottle and easy to clean. Allows air to flow out, as fast as it’s produced." Read more

    "The airlocks are nice, made of plastic, somewhat easy to clean...." Read more

    329 customers mention96 positive233 negative

    Customers are dissatisfied with the fit of the bottle opener. They mention that the bungs are one size too big, the stoppers are non-standard size, and the bottle is too wide. Some say that the product is hard to empty and too tall.

    "Works great with my 3gal / 5 gal / 6 gal carboys. However does not get narrow enough for the 1 gal size carboy (which is fine to me)." Read more

    "...Unfortunately, the bung did not fit in my tiny hole. However, that is my fault. I truly didn't know and just hoped for the best!..." Read more

    "...Installed the grommet, and pressed in the air lock. It is a tight fit and the rubber grommet is firmly, but not over-compressed...." Read more

    "Stoppers are non-standard size, no returns available" Read more

    False Information
    4 Stars
    False Information
    The thing seem to work as intended. About the only complaint I have is that it says that it came with a pack of three. However it only comes with two of them as pictured. Outside of that seems to work as intended. I guess we'll find out with our next batch we make.
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    Top reviews from the United States

    siegsuwa
    5.0 out of 5 stars Works great - cost effect way to make your own fermenter lid
    Reviewed in the United States on September 11, 2023
    Verified Purchase
    I bough this to make a primary fermenter out of a 5-gallon bucket lid. It was super easy. Just had to buy the right grommet and drill a hole.

    Some measurements as I thought it may help others:

    Outside Diameter of the air lock stem is 7/16" (0.43" as measured by my caliper)
    I purchased a 3/8" nominal rubber grommet (0.375" inside diameter) for a nominal hole side of 1/2".
    I used a step drill to make a hole just slightly larger than 1/2". It may have been closer to 9/16ths. Step dril works great for this as you can size it up slowly to test your fit, and the step shoulders de-burr the hole.

    Installed the grommet, and pressed in the air lock. It is a tight fit and the rubber grommet is firmly, but not over-compressed. It has formed a tight air seal and the fermenter is bubbling as a I type.

    Air lock is a simple device that works great.
    Customer image
    siegsuwa
    5.0 out of 5 stars Works great - cost effect way to make your own fermenter lid
    Reviewed in the United States on September 11, 2023
    I bough this to make a primary fermenter out of a 5-gallon bucket lid. It was super easy. Just had to buy the right grommet and drill a hole.

    Some measurements as I thought it may help others:

    Outside Diameter of the air lock stem is 7/16" (0.43" as measured by my caliper)
    I purchased a 3/8" nominal rubber grommet (0.375" inside diameter) for a nominal hole side of 1/2".
    I used a step drill to make a hole just slightly larger than 1/2". It may have been closer to 9/16ths. Step dril works great for this as you can size it up slowly to test your fit, and the step shoulders de-burr the hole.

    Installed the grommet, and pressed in the air lock. It is a tight fit and the rubber grommet is firmly, but not over-compressed. It has formed a tight air seal and the fermenter is bubbling as a I type.

    Air lock is a simple device that works great.
    Images in this review
    Customer image Customer image
    Customer imageCustomer image
    5 people found this helpful
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    Lt.Nine
    5.0 out of 5 stars Good stuff
    Reviewed in the United States on April 5, 2024
    Verified Purchase
    Work for what it was intended
    Helpful
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    ERB
    5.0 out of 5 stars Great
    Reviewed in the United States on August 10, 2023
    Verified Purchase
    Works great with my 3gal / 5 gal / 6 gal carboys. However does not get narrow enough for the 1 gal size carboy (which is fine to me).
    One person found this helpful
    Helpful
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    Cary
    4.0 out of 5 stars False Information
    Reviewed in the United States on March 19, 2024
    Verified Purchase
    The thing seem to work as intended. About the only complaint I have is that it says that it came with a pack of three. However it only comes with two of them as pictured. Outside of that seems to work as intended. I guess we'll find out with our next batch we make.
    Customer image
    Cary
    4.0 out of 5 stars False Information
    Reviewed in the United States on March 19, 2024
    The thing seem to work as intended. About the only complaint I have is that it says that it came with a pack of three. However it only comes with two of them as pictured. Outside of that seems to work as intended. I guess we'll find out with our next batch we make.
    Images in this review
    Customer image
    Customer image
    Helpful
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    Old Alice
    5.0 out of 5 stars Great price! Work well, and fun to watch! Tip to keep them from popping out
    Reviewed in the United States on August 21, 2020
    Verified Purchase
    I bought these as backup airlocks and spares. They work GREAT, but if your ferment is going really strong, they will still pop out (like all the other stoppers - gas from fermentation will steadily push this out).

    wine never gets in the airlocks, so the only thing you have to clean is the water you put in the airlock itself. Not sure how any part of it would even get dirty to need cleaning, the rubber stopper part is the only part that can come in contact with the wine, so you just pop out the airlock, rinse out the bottom, and sterilize the stopper normally.

    For the pop up problem, here's my solution. This works! I tied a ziplock tie around the neck, just under the protruding glass ring at the top of the bottle. Just tight enough to not slide back over the top, but with a small gap where the ziplock closed. Then used a long bread tie, folded in half, and pushed both halves into the small opening in the zip tie. Holding one end of the bread tie, I slid the other end of the bread tie around to the opposite side of the rubber stopper. Pushed the rubber stopper down tight where I wanted it to go, and pulled the bread tie tight on both ends. Then bent both sides of the bread tie up, around the zip tie, on either side of the bottle. I didn't need to twist the breadties, just bending the bread tie ends up was enough to hold the rubber stopper from popping back out, you're only stopping bubbles after all, so it was a very small amount of continuous pressure forcing the rubber stopper back out.

    Hope this helps!
    7 people found this helpful
    Helpful
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    Watchdog
    5.0 out of 5 stars Check the size you need
    Reviewed in the United States on March 13, 2024
    Verified Purchase
    These are good for carboys or gallon jugs.
    I need a slightly larger stopper, but this was easy enough to fabricate and use the airlock
    Helpful
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    Mara
    5.0 out of 5 stars My favorite airlocks.
    Reviewed in the United States on February 4, 2024
    Verified Purchase
    Maybe some people don't like to hear the bubbles pop when starting a wine or fermented beverages but I Love it, it is the work in progress, my "future wine".
    Sometimes I make minimal batches to check flavors as sample and love that can use them even for some milk glass bottles to experiment until I find a flavor to make larger batches.
    (This brand is on the Blaand bottle.)
    Customer image
    Mara
    5.0 out of 5 stars My favorite airlocks.
    Reviewed in the United States on February 4, 2024
    Maybe some people don't like to hear the bubbles pop when starting a wine or fermented beverages but I Love it, it is the work in progress, my "future wine".
    Sometimes I make minimal batches to check flavors as sample and love that can use them even for some milk glass bottles to experiment until I find a flavor to make larger batches.
    (This brand is on the Blaand bottle.)
    Images in this review
    Customer image
    Customer image
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    Happy Wife Happy Life
    3.0 out of 5 stars Delicate, but can get the job done.
    Reviewed in the United States on July 22, 2019
    Verified Purchase
    I purchased these to use with my 1-gallon glass jugs (apple cider vinegar jugs). Unfortunately, the bung did not fit in my tiny hole. However, that is my fault. I truly didn't know and just hoped for the best! My rating does not reflect that as that is in no way the manufacturers fault. My rating is based off the quality. They are incredibly thin plastic - 1 individual piece arrived broken out of the 8 pieces I bought. Putting them into the bung hole and removing them from the bung hole truly makes me worry I will simply snap it off. I also had a problem of getting the water in the right location for the product to work properly. Mind you, there are no directions included. I tried adding the water before and also after inserting it into the bung hole. Before and after inserting it into the jar opening. No matter what method I used, the pressure of inserting it (and closing the path for air to move freely) would push or pull the water one way or another and it simply would not settle where it was supposed to be. On top of that, cleaning these is mildly annoying - not too bad though.

    However, since these bungs did not fit my jars, I ordered a different size (with success!) and also different 3-piece airlocks. The other airlocks were much more durable feeling and the bungs fit my jars perfectly. I did use one single 2-piece airlock with the newer bungs (interchangeable) just to thoroughly test it. I still didn't like the 2-piece airlocks.

    I would personally recommend getting either a more durable 2-piece airlock, or simply a 3 piece airlock. I would choose a 3-piece airlock any day over a 2 piece airlock.

    Overall, pretty decent for the price. I wouldn't recommend to others, but that's personal preference - not because it's a bad product. I know many people have an easy time with 2-piece airlocks. I just happen to find 3-piece airlocks far easier to deal with.
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    Top reviews from other countries

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    Denis
    5.0 out of 5 stars PERFORM AS SHOULD
    Reviewed in Canada on August 23, 2023
    Verified Purchase
    Good product, price is alright, bottom part is some kind of soft plastic instead of rubber.
    Report
    farook
    5.0 out of 5 stars Plastic bubble air lock.Good quality plastic
    Reviewed in India on May 11, 2021
    Verified Purchase
    The product is made out of plastic not glass.
    In the discription of the product they should have mentioned it.
    The red cap does not have any holes it it .The built up vapour travells from under the cap and escapes outside .But the product still works .
    Customer image
    farook
    5.0 out of 5 stars Plastic bubble air lock.Good quality plastic
    Reviewed in India on May 11, 2021
    The product is made out of plastic not glass.
    In the discription of the product they should have mentioned it.
    The red cap does not have any holes it it .The built up vapour travells from under the cap and escapes outside .But the product still works .
    Images in this review
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    One person found this helpful
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    Eugenio Caballo
    5.0 out of 5 stars Muy bueno
    Reviewed in Mexico on April 30, 2019
    Verified Purchase
    El producto es de buena calidad, es de plástico así que espero que no se vaya a romper y me servirá un buen rato. Cumple perfectamente con su propósito. Advertencia - el tapón por lo visto sirve solo para algunas botellas específicas. No va a servir para los garrafones ni de 20 ni de 10 litros aquí en México. Sin embargo esto no le quita los méritos al producto. Luego cuando compre otro tipo de fermentador, me servirán los tapones tambien
    One person found this helpful
     Report
    Matt Cunningham
    5.0 out of 5 stars Just perfect
    Reviewed in Australia on May 31, 2023
    Verified Purchase
    It only just arrived, so I only gave gotten to test the fit so far, but it's absolutely perfect. I'm brewing cider in a 23L glass fermenter. The bung I got from the homebrew shop just did not fit at all and I had to tape it down for the previous brew. This one fits perfectly, very securely, and the air lock fits just as securely.

    I was looking at caps and was astounded at their price in Australia. This fella will surely provide a better seal, though. And the hollow design means that it should fit a slight range of diameters with its ability to flex. Simple is best!
    Customer image
    Matt Cunningham
    5.0 out of 5 stars Just perfect
    Reviewed in Australia on May 31, 2023
    It only just arrived, so I only gave gotten to test the fit so far, but it's absolutely perfect. I'm brewing cider in a 23L glass fermenter. The bung I got from the homebrew shop just did not fit at all and I had to tape it down for the previous brew. This one fits perfectly, very securely, and the air lock fits just as securely.

    I was looking at caps and was astounded at their price in Australia. This fella will surely provide a better seal, though. And the hollow design means that it should fit a slight range of diameters with its ability to flex. Simple is best!
    Images in this review
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    Report
    Mandy Boulton
    5.0 out of 5 stars Good quality
    Reviewed in Canada on November 12, 2023
    Verified Purchase
    Great quality and does exactly what I need and gold seal
    Report