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Twin Bubble Airlock and Carboy Bung (Pack of 2)

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$6.39

$ 2 .99 $2.99

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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.



Product Description

Quality equipment for home brewers and wine makers.

Fermtech Banner

About Us..

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.

Must haves for any homebrewer!

auto-siphon

Auto-Siphon

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?

  • Starts with one stroke: Simply pump the auto-siphon to get liquid out from a carboy and into another.
  • Anti-sediment tip: We designed a the tip to be a leak-free and is removeable for easy cleaning.
  • Easy-to-clean: All of our siphons disassemble easily for cleaning.

We offer a variety of sizes for your brewing needs!

Mini 2 Filtration System

Mini 2 Filtration System

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?

  • Cost Effective: We have the most economically priced filtration system on the market. Great for anyone getting into homebrewing who doesn't want to spend a lot.
  • Multifunctional. Not only can you filter, you can use this machine to transfer liquid from one carboy to another, perfect for racking!
  • Variety of Filter Pads: We offer a wide range of filter cartridges with different micron sizes, making sure no matter what needs filtered, we got the pad for the job!

An excellent wine filter for the hobbyist that is affordable!

wine thief

Wine Thief

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?

  • Easy-to-use: Allows you to sample your wine or wort with no pouring or siphoning.
  • Fast and Efficient: Quicker than using a regular test jar, it lets you return the worth to the fermenter with less risk of infection, cutting down on losing any of your finished product.
  • Innovative Tip: Return wine/beer to carboy by gently touching tip against the walls of the carboy.

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.

fermtech

Hubcap
2025-08-13 16:27:59
Works great will buy again
siegsuwa
2025-08-12 17:23:10
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.
Fr@nk
2025-05-16 11:06:18
Fit 3 gallons carboys
Battery Guy
2025-05-09 11:38:28
Works ok.
alm
2025-05-07 16:49:38
Perfect for what I needed
Old Alice
2025-04-02 09:08:04
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!
Keith
2025-03-28 18:38:03
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Happy Wife Happy Life
2025-02-25 15:35:57
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.
dave glode
2025-02-21 11:58:50
good product, safely packaged, arrived in good shape
farook
2025-02-04 18:35:56
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 .
Eugenio Caballo
2025-01-25 13:02:17
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
Matt Cunningham
2025-01-10 15:04:41
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!
Martha Eugenia Chamoza Benites
2025-01-04 20:38:52
Muy funcionales para hacer vinos artesanales en casa
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