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Big Mouth Bubbler® EVO 2 - 6.5 Gallon Glass Fermentor


SKU# 41326

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The fermentor that started it all, reinvented again! We’ve taken the revolutionary Big Mouth Bubbler® glass and re-engineered it with the help of world-class Polish master glassmakers to ensure sturdy, solid, superior craftsmanship.

Extra-thick glass eliminates oxygen permeation and keeps your brew safe. Banish bugs and bacteria with perfectly air-tight seals from a carefully ground, completely smooth and obsessively flat neck top.

In the evolution of Big Mouth Bubbler®, we’ve added some perks! Instantly measure volume with gallon graduation marks. Easier transfer of clear beer with a taller, narrower body while ensuring less liquid is left behind.

Please note: This item does not qualify for flat rate shipping.


Availability: In stock

Get it in Ashburn by Wed May 30.
Big Mouth Bubbler® EVO 2 - 6.5 Gallon Glass Fermentor - Now with the Universal Lid

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  • Big Mouth Bubbler® EVO 2 - 6.5 Gallon Glass Fermentor
  • Big Mouth Bubbler® Universal Lid
  • Big Mouth Bubbler® Universal Lid
Product Details

Bid your funnel and siphon sayonara! Pour cooled wort directly from your kettle into the Big Mouth Bubbler® for instant transfers. Pitch yeast without it running down the sides of your fermentor. Easily add flavorings to secondary, and then just as easily remove them!

Gallon graduation markings help ensure precise measurement of fermenter volume.

Last but not least, you asked and we listened—more space for the adhesive FermagraF° LCD thermometer than any other glass fermentor! The most obsessively engineered glass fermentor ever created—we are proud and excited to introduce the new and improved Big Mouth Bubbler® EVO 2.

Note: We still strongly recommend the Big Mouth Bubbler® carrying harness.

Each Big Mouth Bubbler® Includes:

  • Big Mouth Bubbler® Glass Fermentor, Universal Lid*
  • Big Mouth Bubbler® Microfiber Cleaning Cloth

*The new Big Mouth Universal Lid (included) fits all Big Mouth Bubbler® Fermentors. The Big Mouth Bubbler® Universal Lid is just like a traditional carboy bung, only bigger! Just as easy to sanitize and set in place too. Ribbed silicone rings ensure a positive seal to keep out pests, while the non-threaded design allows the lid to move preventing an out-of-control fermentation from dangerously pressurizing your fermentor.

You will also need a Small Universal Carboy Bung - drilled or solid.
Product SKU41325 (5 Gal.)41326 (6.5 Gal.)
Weight13.5 lbs.16.5 lbs.
Height (w/ lid, closed)18"17.5"
Mouth Diameter5.25"5.55"

Caution: Big Mouth Bubbler® is a large hand-formed glass item that can be easily damaged if not used with proper care and handling. It may have variations in shape and thickness, and will show the normal bubbling characteristics of hand-formed glass. Extreme changes in temperature or sudden contact with hard surfaces may cause glass to crack. Handle with care–we strongly recommend using the Big Mouth Bubbler® carrying harness for increased safety and ease of handling.

*Pro Tip: Save your box and use it as a cover for your fermenter!

6.5 Gallon fermenters are perfect for the primary stage of beer or wine fermentation. The extra head space allows for the production of krausen on a 5 gallon batch of beer. Also available as a 5-gallon secondary fermentor.
3.6 / 5.0
229 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Great fermentor
Love this for the wide mouth. Easy to clean and have had no issues with the top coming off. I give it 5 stars (the stars werent cooperating so I'm not sure what will show up!)
May 21, 2018
1 month ago
Came in one piece, well packed.Havent fermented any Beers yet
April 29, 2018
1 month ago
Great carboy, iffy lid design
Like many others, my only complaint is the lid not staying down when wet (e.g., from sanitizing solution). Otherwise fantastic - very solid. Love being able to clean without PBW.
April 24, 2018
2 months ago
I’ve been waiting for this fermenter to come out I would recommend it to anyone easy to clean fantastic lid
April 23, 2018
2 months ago
Easy to fill and clean. The only thing I didn’t care for was the lid it doesn’t like to stay on when you first put it on. I used electrical tap to keep it on.
April 22, 2018
2 months ago
I don't like that the cove doesn't stay in the jar. Had to put a weight on top to keep it tight.
April 9, 2018
2 months ago
the lid design is seriously flawed
the lid pops off without any positive pressure. I had to have a friend hold the lid down while I taped it to the carboy for it to stay in.

I love the glass portion but seeing as how I can't use it to ferment anything due to the lid being useless it gets 1 star. It would be a 5 star product if the lid was usable in any way.
March 21, 2018
Quality Carboy
Love it! Thick glass, smooth finish, and easy to clean. Strongly suggest that you buy the carrying harness. Well worth the extra twenty bucks. Lid, well, that’s another subject. This glass fermenter is excellent. The 5 gallon is just as nice.
March 17, 2018
3 months ago
Good almost outweighs the bad
The good: easily to clean. That’s why I bought it.
Bad: the lid sucks. When something’s as light as a saison can make the lid pop off, that’s a good indication that the design is flawed.
If the big mouth bubbler v3.0 had a screw on lid like the small version, it would be a no brainer. As it is, the price of easy cleaning is to have two bricks on hand that you can set on top of the lid to keep it from popping off.
March 12, 2018
2 months ago
I like the size of the bottle as well as the mouth. It’s perfect for the amount of fruit needed for making vinegar.
March 8, 2018
3 months ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 25 questions Browse 25 questions and 61 answers
Does the Big Mout Bubbler have volume markings?
A shopper on Jun 20, 2017
Big Mouth Bubbler® EVO 2 - 6.5 Gallon Glass Fermentor
Big Mouth Bubbler® EVO 2 - 6.5 Gallon Glass Fermentor
Big Mouth Bubbler Plastic - 5 Gallon
Big Mouth Bubbler Plastic - 5 Gallon
Big Mouth Bubbler® EVO 2 - 5 Gallon Glass Fermentor
Big Mouth Bubbler® EVO 2 - 5 Gallon Glass Fermentor
Big Mouth Bubbler® EVO 2 - Siphonless 6.5 Gallon Glass Fermentor
Big Mouth Bubbler® EVO 2 - Siphonless 6.5 Gallon Glass Fermentor
Siphonless Big Mouth Bubbler® - Ported 5 Gallon Plastic Fermentor
Siphonless Big Mouth Bubbler® - Ported 5 Gallon Plastic Fermentor
Siphonless Big Mouth Bubbler® - Ported 6.5 Gallon Plastic Fermentor
Siphonless Big Mouth Bubbler® - Ported 6.5 Gallon Plastic Fermentor
Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor
Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor
Big Mouth Bubbler® - 5 Gallon Plastic Fermentor
Big Mouth Bubbler® - 5 Gallon Plastic Fermentor
BEST ANSWER: Yes, the Big Mouth Bubbler Plastic does have indentations as markings but does not have numbers 1 - 5 or .
You have to count them to determine at what level you are at.
I'm interested in purchasing one of these as it's the only glass fermenter compatible with the Brew Jacket. There seem to have been a lot of complaints about the lid. Has this issue been fixed, or would I be rolling the dice purchasing one of these?
Josh H on Jul 11, 2016
BEST ANSWER: Most folks have had good luck with these, but some have had issues getting the lid to stay where they want it. But the lid for this does not have to stay "all the way down" for it to be functioning correctly. Some have had good luck just inverting the silicone seal-ring on the new lid to have it hold in place more securely. These are really nice fermenters, the lid is not a problem in the vast majority of cases. -Mike W, Northern Brewer
If the Universal lid does not have a solid seal (which seems to be a common issue from reading reviews), are there any other options?
M I on Feb 4, 2016

There are other options. The main issue seems to be not so much with the new lids as with some of the the older Evo2's. As far as I can tell, it seems like there can be some variance in the inner diameter of the opening. BMB did straighten it out, so all the ones we currently sell should fit just fine. But if you get it and it doesn't seal adequately, we could talk about replacing the carboy or refunding you for the lid.


Im curious as to why BMB hasnt come up with or developed a large screw on ring (similar to a Ball Mason canning jar) to hold the lid down. Has anyone at NB had this conversation with BMB?
A shopper on May 24, 2017
BEST ANSWER: Actually, it is my understanding that you don't want an air tight seal. Ribbed silicone rings ensure a positive seal to keep out pests, while the non-threaded design allows the lid to move preventing an out-of-control fermentation from dangerously pressurizing your fermentor. I had a screw on lid, like you describe, when I first ordered the big mouth bubbler but I'm using the ribbed cap and it works fine
Why do people have so much trouble with the lid popping off, are they over filling them? Do their airlock not work? Or does the seal just slide lose by itself, I can't see pressure building up if the airlock is working properly.
Jeffrey Stachnik on Nov 8, 2017
BEST ANSWER: I can only tell you the two things that I do to compensate: 1) I add 5-6 lbs of weight on top of the lid. Whatever you can find. I use lead weights. 2) I attach a 1/2" I.D. vinyl blow-off tube directly onto the airlock (without water, blubber, or lid) that goes into a 1/2 gal Mason jar filled half way with water. When the active fermentation subsides, I attach a regular airlock and no longer need the weight.
Is glass EVO 2 safe for pulling a vacuum on to degas wine? I like to use a vacuum pump to degas wine kits. Don't want to order one of these if it's going to implode and spew wine all over my kitchen. Thanks!
U F on Jul 30, 2016
BEST ANSWER: Implosion would not be a problem in my opinion. But the lid is. I found the Big Mouth lid would not stay on during beer fermentation, even when vented with a hose. The foam forced it off the bottle. I had to weigh it down with bricks for it to stay in place.
Temperature Swing? What kind of temp swing can this glass handle? Say 70-80º start....
A shopper on Feb 20, 2018
BEST ANSWER: I haven't gone above 70°, but I frequently go from 68° degrees to cold crashing around 34° and haven't had any problems.
Having a problem with universal lid migrating up and leaking on big mouth evo 2 glass. A blow off tube is installed. I've added a 3 lb weight and seems to be holding, but is there a solid fix/solution to this problem? The universal lid does seem to work more effectively on the plastic big mouth though. Thank you

-Javier Lopez
Javier L on Apr 26, 2017
BEST ANSWER: Great question! Start by making sure the silicone and also inner rim of the Bubbler are both dry before sealing. Push the cover onto the Bubbler and twist the top back and forth a bit as if screwing and unscrewing a lid. This will fully seat the gasket. During extra vigorous ferments you also may want to follow these same instructions but flip the gasket on the lid upside down. This will create an extremely tight fit.
Do they have drying racks for these like the old style carboys have?
K E on Dec 29, 2015
BEST ANSWER: The old blue ones will work fine. Just flip it upside down!
What is the bottom on the inside of this carboy like? Would I be able to put this on a stir plate to aerate yeast?
A shopper on Dec 27, 2016
BEST ANSWER: It is domed (concave as viewed from the underside), so you'd need a strong magnet in the stir plate to keep the stir bar in place. More than that, I'd be concerned about how it will rest on the stir plate. On a square stir plate, it will be sitting only on the four corners -- if you have much liquid in it, I'd be concerned about that concentrated pressure cracking the glass. These are made to be resting on their circular bottom.
I recently received two of these bubblers through a promotion and was really excited. According to the photos on your site, it shows the plastic 6.5's coming with the old style lid. Naturally after seeing online reviews, I also purchased two universal lids so that I could use the old lids with the new ones as one unit . Sadly I received no old lids like in the photos and got 4 universals instead. Customer service refunded me for two lids and assured me the universals will work without any issues. Well, we have issues. After a few brews, the universal lid pops up during fermentation and leaks. And yes I have tried installing them dry. Is the any way to get the old lids anywhere??? Also what is northern brewer doing about this for us consumers who spend our hard earned money on your products? So far I'm concerned about my brew going bad, and that's not just a cheap batch to say "oh well" on. Please help!
B H on May 15, 2016
BEST ANSWER: I have one of the glass EVO 2 Big Mouth Bubbler with the old lid and one with the new universal lid. I much prefer the old lid. I recognize that they received a number of complaints from people who didn't understand how to tighten (break in) the old style lid and had gas leaks but having an option to buy the old style would be wonderful.
Can these be used for no chill? Or would the temperature change Crack them?
Jeremiah S on Apr 18, 2016

Thanks for your question. The temperature change would indeed crack the glass.

Is there anyway to keep new lid down without duct tape. I like the bigmouth design. New lid pops up without pressure. I brewed northy12 and secured with tape to not loose it.
matt p. on Mar 7, 2016
BEST ANSWER: There are options for editing an original lid to act as a screw down to secure it, basically cutting out the middle of it. Usually if you allow it to dry, give the lid a twist to seat it, it should hold. Be sure to not over fill and that it is not clogging and actual yeast foam is pushing the lid out. Consider contacting customer service about the quality of your product received. A weight will also hold it down if experiencing this issue.
When will the new lid be available as a separate item to purchase for those of us who bought the poorly designed predecessor?
A M on Oct 23, 2015
BEST ANSWER: If having issues with an old lid we'd be happy to replace it. If placing a new order we would be happy to throw it in with the same shipment. It is available online now as well.
Are there any plans to port the Glass Big mouth bubbler like the plastic ones?
J B on Oct 7, 2015
BEST ANSWER: Right now I'm not aware of any plans to offer a product like that

but new products are handled by a different department and we here in Customer Service get little to no heads up about these matters. Cheers. -Tyler
Is the height of the 6.5 gallon really 17.5 inches? The 5 gallon is listed as 0.5 inches taller.
A shopper on Jun 1, 2017
BEST ANSWER: It is 17.5". The 5 gallon is a lot skinnier and taller. Cheers!
What is the circumference?
A shopper on Nov 30, 2016
BEST ANSWER: Hi there, the circumference is about 38 inches. Cheers!
Is it possible to buy one of these with the screw-on type lid?
K E on Aug 24, 2016

Thanks for contacting us! We kept stock of the old lids at first, but we don't have any left, and they are no longer being manufactured.
Will there be a screw on lid available? The universal lids do no fit properly and come off easy which makes transporting difficult. There are threads on the container so a screw lid should be helpful. Thanks
J A on Apr 28, 2016
BEST ANSWER: Thanks for the suggestion. A screw lid used to be standard, but variations in hand formed glass lead to poor seals. We'll consider this feedback about being able to transport the fermentor for the future. Cheers!
If there was a way to put a spigot this would be awesome. I like the spigot from the Big mouth plastic bubbler. It is easier all the way around and do not need to siphon. Process steps get cut down and so do cleaning.
Anthony P on Mar 25, 2016
BEST ANSWER: We do offer a siphonless version of this fermentor. Item number 41846
I read the reviews. Still bought new style. I thought the blow off tube and high gravity brew might have been culpret. Found no bubble and active ferment.spray sanitizer on big blow off tube bought with new glass carboy.found it to bubble. Lid still pops up. Changed airlocks. No matter what I do lid pops up after seconds. I don't want to remove it. Is this common? Is there fix besides duct tape which it even peels up? Will old screw lid go over new style to thread it secure? I really don't wanna ruin any brew!
matt p. on Mar 15, 2016
BEST ANSWER: When inserting the lid, ensure that the interior of the Bubbler's mouth is dry; this will increase friction and provide a better seal. The lid should not pop up, but if it does, this is unlikely to negatively impact your beer. The old screw lid will not fit perfectly over the new universal lid without modification.
Based on a Northern Brewer Youtube video, on video it look like the glass fermenter is a screw top... are the pics on website outdated? or did I see it wrong? is the glass fermenter a screw on?
G I on Feb 16, 2016

Thank you for choosing Northern Brewer! The bubbler in the video is outdated. The new improved lid is not a screw on lid.
I received both the screw top and universal lids in my box. The threads are definitely a problem so I thought I would try just fitting on the universal which I have two of. I could not get thediet of them to stay on tight. They just pop up with even the slightest pressure. Will this get better when I put it on with an airlock on it? Or how have others had luck? Thanks.
T J on Dec 30, 2015
BEST ANSWER: The universal lids have a tendency to pop up under pressure. We recommend taping them down or gently strapping them down to prevent this. However, even if you were not to further secure the lids, the gas exchange will not severely impact the quality of your brew.
I have one of these with the old crappy lid that does not seal. can I buy just this new lid and will it fit. I just bought the old on around a month or so ago and feel like I got took.
A C on Oct 24, 2015

Do you have the order number (or numbers) that you purchased your big mouths under

I went through your 5 or 6 most recent orders and I couldn't find any big mouths although I may have missed it. Please contact us either by email at brewmaster@northernbrewer.com or by telephone at 1-800-681-2739 option 1.

I should be able to set you up with a lid or two.
Is the bung hole large enough to accomodate a raking cane?
S T on Oct 23, 2015
BEST ANSWER: Yes. With the new Universal Lid it will take a small universal carboy bung which will be able to handle an auto-siphon easily.

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