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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

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
208 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Very well constructed. Very heavy, I'm not sure about this one yet. I also have them in plastic and love them. I thought I'd give this glass one a try, but once full its very heavy. I would recommend the lifting strap for this if you get one. The lip on the top is very short so if you don't dry it off before assembly the lid will pop off, if dried properly I have no problem.
December 20, 2017
2 months ago
Well built
Seems well built, so far 1 brew using it successfully. I got the 400 micron strainer for f2 (I am brewing Kombucha) and the harness to move it around the house. Well worth the investment I expect it lasts as long as I take care of it.
December 19, 2017
1 month ago
Excellent product.
Excellent product. I use it with my depth charge for additions to my brew. Excellent team.
December 12, 2017
2 months ago
Not happy at all going to return them
Not happy at all going to return them this was our first time using them and the lids were popping off called Nothern Brewer they told us to turn the seal around on the lid then it would not seal correctly it was leaking so now I am back with 2 x 4‘s and weight sitting on them all the lids closed
Not sealing correct
User submitted image
User submitted image
December 11, 2017
2 months ago
Great product but one minor issue.
Arrived on time, in pristine packaging (as usual).

Its currently hard at work and looks great!

My only gripe is that the lid does not sit tight. The lid pops off after only a few minutes. My work-around is simply taping up the lid.
December 11, 2017
2 months ago
Loved it so much i had to buy it twice. Dropped the first one as I was getting it out of the box shortly after UPS delivered it. Shattered all over my tile floor. Still in the fermentation but it looks like it will be easier to clean.
December 9, 2017
2 months ago
Easy to clean, easy to dry hop with depth charge??
Easy to clean, tricky to keep sealed this is what works for me.
How I keep the lids on...
How I keep the lids on...
December 4, 2017
2 months ago
Issues with the lid
I really wanted to like this fermentor and was hoping that many of the comments relating to the lid may be been corrected but they have not. Be warned, the lid does not stay on as well as it should and routinely pops up, forming a less than secure fit. While I do not think that my first batch of beer was ruined using this, I am very caution about using the product again. If they could fix this issue it would be a great product but unfortunately I cannot recommend this.
November 13, 2017
2 months ago
Excellent wine fermenter
Easy to clean. Add and extract fruits with ease. My tops have never blown off in over twenty ferments. Spigot makes racking, re-racking, and bottling a breeze. Clean up is easy. Well worth the money. I only wish they made the exact same product in about a 3 gallon size to experiment more often with less consumable stock.
October 30, 2017
Horrible lid....
Terrible. Worst fermenter ever. The lid blew off during fermentation and ruined the whole batch.
October 25, 2017
3 months ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 24 questions Browse 24 questions and 56 answers
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.


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
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.
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 S 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.
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: I have no clue. But with the open mouth you can get your hand in to dry it out with the supplied micro fiber towel
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
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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