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FastRack

Fastrack Twin Bubble Airlock and Carboy Bung (2-Pack) | Fermentation Airlocks for Homebrewing Beer, Wine, Mead, and Kombucha

  • Based on 13,904 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Homebrewers Outpost
Arrives Sep 11 – Sep 13
Order within 10 hours and 55 minutes
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Description

In 1987, we invented the infamous Auto-Siphon. Today, we continue the great tradition of inventing new high quality products for the at home wine makers. Fermtech has been expanding its product line since then and has grown to become one of the top companies of quality equipment for home brewers and vintners. Here at Fermtech, we've always believed to offer vintners and homebrewers a variety of different tools to make their jobs easier while keeping costs low for our customers. Last year, we realized we we're missing something from our wide range of products, a filtration system. We created our newest product, the Mini 2 filtration system. This filter machine is easy-to-use, reliable and most importantly, affordable for your average vintners and homebrewers. Fermtech products are precision-engineered to meet the unique needs and preferences of home brewers and vintners around the world. We pride ourselves on making sure our customers have the best products and tools to help them achieve their perfect homebrewed drink. This is the product that started it all. Created in 1987, the auto siphon changed the game in the home brewing industry. Never again will you have to start a siphon the old fashioned way! What makes our siphons different from competitors? We offer a variety of sizes for your brewing needs! Our newest invention to help Vintners and Homebrewers have the clearest and smoothest beverage that is affordable! How does our filtration stand out to others on the market? An excellent wine filter for the hobbyist that is affordable! The perfect tool that is used for extracting samples from jugs, carboys, barrels and other vessels. Draw samples and take a hydrometer reading at the same time What makes our wine thief's stand out from others on the market? Bring your testing to the 21st Century! Please feel free to check out all the products we offer! From siphons to bottle washers, we aim to provide all the tools a Vintner or Homebrewer will need.

Material: Plastic, Rubber


Color: Clear/Tan


Brand: FastRack


Item Weight: 30 g


Product Dimensions: 3.15"L x 1.97"W


Unit Count: 2 Count


Number of Packs: 2


Manufacturer: Fermtech


UPC:


Number of Items: 2


Product Dimensions ‏ : ‎ 3.15 x 1.97 x 3.15 inches; 1.06 ounces


Item model number ‏ : ‎ B00A6TRKO4


Date First Available ‏ : ‎ November 13, 2012


Manufacturer ‏ : ‎ Fermtech


Best Sellers Rank: #20,485 in Kitchen & Dining (See Top 100 in Kitchen & Dining) #7 in Brewing & Fermentation Airlocks


#7 in Brewing & Fermentation Airlocks:


Customer Reviews: 4.6 4.6 out of 5 stars (13,904)


Brand Name: FastRack


Unit Count: 2 Count


Number of Packs: 2


Manufacturer: Fermtech


UPC: 628504292792 825392000052


Number of Items: 2


Item Form: physical component


Global Trade Identification Number: 52


Included Components: Airlock and Stopper (Pack of 2)


Item Type Name: Bubble Airlock and Bung (2pk)


Model Number: B00A6TRKO4


Manufacturer Part Number: B00A6TRKO4


Material Type: Plastic, Rubber


Item Weight: 30 g


Item Dimensions L x W: 3.15"L x 1.97"W


Color: Clear/Tan


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sep 11 – Sep 13

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Great quality fits my bunghole perfect
Review Image by William Wood
Very high quality product nice and large size air locks. High quality bungholes too . The bungholes are perfect for the size of the airlock and they would adapt from anything to a jar up to a large milk jug or even a barrel. Perfect quality and high quality.
Reviewed in the United States on June 20, 2026 by William Wood
    • Reliable airlocks for small home wine batches
These worked great during a recent 5 gallon wine fermentation. The bungs sealed tightly in my glass carboy and I didn’t notice any leaks or pressure issues. The twin bubble design made it easy to keep an eye on fermentation activity, especially during the first few days. They also cleaned up easily afterward which is always a plus with brewing equipment. Simple product, but dependable. ... show more
Reviewed in the United States on May 20, 2026 by Crystal norris
    • Quality bubblers!
Review Image by TwoFourSevenDIY
Review Image by TwoFourSevenDIY
Great for homemade wine making. I used these without the stopper on my primary fermenter and with the stopper on my secondary glass carboy. They are well made and work very well. I did notice the stoppers liked to slip up out of the neck of the glass carboy a little so I had to tie them down into the neck but this may be unrelated to the stopper itself. ... show more
Reviewed in the United States on October 27, 2025 by TwoFourSevenDIY
    • My favorite… mostly
The airlock valves are awesome (unless they arrive broken) but the stoppers are completely worthless.
Reviewed in the United States on July 3, 2026 by mEtApHoRiK
    • Great price! Work well, and fun to watch! Tip to keep them from popping out
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! ... show more
Reviewed in the United States on August 21, 2020 by Old Alice
    • Good product
Been using these for three years and they’re still kicking so they still work rubber still good everything
Reviewed in the United States on March 8, 2026 by john w.
    • Airlock works good
I have 2 gallon carboy used to make small mead batches, but the plastic airlocks cracked, I went ahead and ordered this ones and cant be happier, they work good my only complaint is that if I fill my carboy too high the foaming from fermentation will get in the airlock making it difficult to clean up. These are a little taller than the old ones but they are good value ... show more
Reviewed in the United States on August 31, 2025 by Carlos
    • Delicate, but can get the job done.
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. ... show more
Reviewed in the United States on July 22, 2019 by Happy Wife Happy Life

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