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Bubbler Airlock


SKU# 7008

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Fill the Bubbler Airlock with water and insert in drilled stopper or bung to vent gases during fermentation.


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Bubbler Air Lock

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  • Bubbler Air Lock
Product Details

Fill with water and insert in drilled stopper or bung to vent gases during fermentation. "Bubbler" style airlock makes a gratifying "bloop" noise during active fermentation. It is the preferred airlock for secondary fermentation, as it is possible to monitor the pressure inside the fermenter.

Additional Information
Support Documents:No
4.1 / 5.0
46 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
I like these airlocks better than 3 piece
These are great airlocks. However, why do the clear caps have holes for venting and the red caps are solid without vent holes?
May 9, 2014
Much easier to see fermentation activity than with a 3 piece.
When your brew is getting down to the end of fermentation, these still show obvious activity where the 3 piece ones don't bubble visibly, so the are nearly impossible to tell if anything is happening. No matter how slow your brew is working, assuming of course your fermenter is all sealed up, these show activity. You can watch as each bubble is slowly pushes liquid through the S Trap.I NEVER use Star San in these btw. It foams and blows out. Vodka only for me.
September 7, 2015
Quality airlock
These work great. I love listening to the bloop bloop sound as it ferments. I haven't needed to clean mine yet... not really sure why you would need to, unless you have a lot of overflow or something.
October 10, 2013
Great for carboy or barrel!
This airlock is great for second fermentation while making beer and also great for my 50 gal. barrel when I make hard cider! My wife bought this airlock with the Big Mouth Bubbler for myself as a Christmas gift. After looking at the design of the Big Mouth Bubbler lid, I decided I did not need an airlock. I filled the recessed plastic carboy lid with Star san, and snapped on the white plastic vented cap that came with the carboy. BLUP, BLUP, BLUP...It worked just fine! However, I use this type of airlock during second stage fermentation with standard carboys, never during first because of possible blow-offs. I once made the mistake of using it on a first fermentation and it whistled like a tea kettle because of too much pressure. Luckily I found it before I had a huge mess and changed to a blow off hose.
January 23, 2014
More detailed information
This bubblier air lock, made in Italy, is a plastic one piece design, Measuring 6 5/8 inches by 2 1/8 wide and fits a 3/8 inch diameter hole. The tube, that inserts into the stopper, is not tapered and measures 0.391 inches. I use this air lock with a soda bottle cap drilled with a 3/8 inch diameter hole and without sealant it is airtight.
January 2, 2011
strange contraption
I used this on a High Gravity beer and it blew the water right out the top after the fermentation really strated taking off. I did do a yeast starter with wyeast high gravity and can honestly say it was quite amusing to see. I went back to the old style airlock, with a blowoff tube, and even though it was chugging like an out of control freight train it held its own with unbelievable blow off for the first 6 hours. If there was an improvement, I'd say make this thing about a half inch bigger and it might stand a chance to very aggresive yeast cultures... until then, it'll sit in my stockpile of things I tried and didn't like.
March 14, 2016
Too fragil
While I like to see the bubbles and listen to the bloops, these are way to fragil. I've snapped many while trying to extract them from corks in order to clean them. And cleaning must be done with clorox.
May 27, 2011
Cheap but does the trick
I have this airlock on my first batch of beer as we speak and it's working just fine. Would buy again.
October 9, 2017
2 months ago
great basic air lock
This bubbler air lock works great for lower-yeast beers. Get the drilled carboy bung stopper and it pulls out easily. For anything too exciting (an over-bubbly brew) buy a hose and a bucket and make your own airlock.
June 27, 2012
Perfect. Just what I needed.
May 28, 2016
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 7 questions Browse 7 questions and 18 answers
Do you keep the red cap on the airlock during fermentation? thanks Dave
C H on Jan 1, 2016

Sure, you can. It's not really that important. I've lost most of my red caps! They're nice for keeping fruit flies out of the airlock, but that's about it.


Is this made out of glass or plastic?
Paul W on Feb 5, 2017
BEST ANSWER: These are plastic-durable and fairly easy to clean. Depending on what sanitizing solution you use will last and last for many batches...
im brewing the Irish Ale and at almost 48 hours post-brew -- still little to no bubbling, and the water in the airlock fluctuates back and forth... Still normal?
Andrew B on Mar 2, 2016
BEST ANSWER: The water going back and forth is from temp. change. It's possible for there to be a lag before fermentation starts but I've never had one 48 hours. Maybe the yeast you pitched is dead or you didn't pitch enough.
Can the bubbler airlock be used with small batch kits?
R M on Jan 12, 2016
BEST ANSWER: It could be, yes. If you use the 38 mm screw caps, those will only work with the three piece airlock. But if you have a rubber stopper in your fermentor, a three piece or S-bubble type will work in those. I hope that clarifies! Cheers!
So I put the sanitizer solution in my airlock and made sure that both sides were only filled to the "max" line on each side. No excess. But now that my beer has been sitting for about half an hour the air lock is almost full on one side and empty on the other. Why is this? How do I fix this?
B R on Dec 27, 2015
BEST ANSWER: Hello Brian,

Thank you for choosing Northern Brewer! There is nothing to fix. That is what that airlock does when it comes under the pressure of CO2 from the fermentation going on inside of your fermentation vessel. Nothing to do here but sit back, relax, and let the fermentation commence!
Does anyone know the outside diameter of the top of the airlock (i.e. the inside diameter of the red cap)? I would like to hook a tube up to the top of this airlock to capture CO2 and purge my secondary carboy, but need to know what diameter tube to get.
A shopper on Feb 1, 2017
BEST ANSWER: Hi there,
It's about 3/4" but can vary based on production. Cheers!
I got 2 of these with my starter kit. Have used them on my first 5 brews. I went out and bought a new S shaped airlock yesterday that came with a clear cap that has three holes in the cap. The red caps do not appear to have holes? Was I supposed to put holes in the cap?
T S on Apr 24, 2016
BEST ANSWER: The red caps do not have holes in them. The CO2 is allowed to escape from where the cap meets the bubbler airlock. I hope that this helps!

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