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Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor


SKU# U41965


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Big Mouth Bubbler® Plastic is a virtually indestructible fermentor, equipped with 3” thick anti-flex ribs, a punted bottom and decreased base diameter for extreme strength and durability. Its smaller footprint preserves precious brew cave space and allows for convenient storage inside a standard brewing bucket.

Included: Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor, single-port universal lid.
Required: Small Universal Stopper & airlock. Configure options below.

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Big Mouth Bubbler Plastic - 6.5 Gallon   +$29.99
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Big Mouth Bubbler™ - 6.5 Gallon Plastic Fermentor

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  • Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor
  • Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor
  • Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor Lid


Product Details

Superior to a carboy, Big Mouth Bubbler® Plastic prevents off-flavors by enabling you to keep the lid on during testing and transfer, avoiding exposure to oxygen with standard-sized ports that can accommodate most fermentation-monitoring equipment.

The punted bottom promotes crystal-clear beer by efficiently settling out yeast from finished fermentations. Graduation marks make volume measurement instant and effortless. And, of course, its revolutionary wide mouth eliminates the nightmare of cleaning and sanitizing by giving you direct hands-on access to attack crusted krausen, while simultaneously offering unlimited flexibility in dry-hopping and flavor additions.

*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.

The optional Dual Port Lid allows for the use of a temperature controller probe. The ThermoStar Dual-Mode Digital Temperature Controller with optional 12" stainless probe ensures precise and repeatable fermentation temperatures!

Lid port works with our Small Universal Stopper or a standard 6.5 rubber stopper.

Important Note: Do not fill any Plastic Big Mouth Bubbler® fermenters with very hot liquid - temp should not exceed 140 degrees Farenheit (60 celcius)

BIG MOUTH BUBBLER® Product Specifications:
Capacity:5 gallon6.5 gallon
Height (w/lid, closed):22"23"
Fermentor Material:PETPET

Note: We recommend a soft cloth for cleaning the inside. Standard carboy brushes will scratch plastic fermenters leaving places for grime to hide. A warm cleaning solution will suffice. Do not use hot water on plastic fermenters of any sort. The Big Mouth Bubbler® is compatible with a standard carboy dryer when the dryer is used inverted.

*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
151 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
AG They switched the lids
The first time I bought these, they had the screw top lids, which worked perfectly for 2F. I reordered, not thinking to check, and all my new ones came with the universal lids. I've had the universal lids in the past and they are a f***ing nightmare. I don't know why they don't at least offer the option of the old lids. Looks like the ported lids are available, but not the piece that screws them on. I am SO peeved I have to deal with these lids again. Please consider reinstating the old ones as an option. I feel like I just wasted $120.
September 2, 2016
Big Mouth bubbler universal Lids are terrible
I don't know why the lids changed. The screw top ones were great. These new lids won't seal and I'm afraid i'm going to lose a batch due to the lack of a seal. The container itself is great. Please go back to the old lids or make them available to those who want them. I would gladly send you my universal lids back for the screw on type.
December 11, 2016
1 year ago
batch ruined
not good,came home and lid was on the floor.bottled it and got off flavors and dumped the whole batch..waste of money,waste of time!.ill get the screw top from more beer and use this for a seconday
January 21, 2017
Still has lid problems
The lid pushes itself out after a Starsan rinse. I secured the lid with two five pound weights for my first brew. I've read on forums that people have flipped the gasket on the lid to help it seal better. I haven't tried this, but I shouldn't need to either.
September 21, 2016
Bubbler itself is good, the lids makes it unusable
The universal lid makes these unusable. Once fermentation starts, the lid loosens up, looses it's seal. I've tried different lids. I've tried making sure everything is dry. I've tried everything. If you read the reviews on here and other sites you'll see the same complaint. You need to put a heavy weight on top of this to keep it air tight. It's the worst thing you could buy for fermenting beer, the biggest thing you need is an airtight container and this does not do that
February 21, 2017
8 months ago
Lids Don't Work
Despite following NB's instructions (turn the plastic seal upside down, place on container when dry) the lid does not stay sealed. I had to put a large brick on top to keep it from being pushed up and out by the fermentation. The container works fine, but not the lid. Whoever makes this product--FIX IT CORRECTLY.
February 22, 2017
8 months ago
The lids are terrible.
The plastic carboy itself is nice, durable, and lightweight. The lids suck. They won't stay in the carboy, even when its empty. I've done batches with airlocks and blowoffs, and every time I end up having to tape the lid down to the carboy itself. The carboys still have threads on them, so it would be great to have a screw on option. I wouldn't buy these again.
February 28, 2017
Good Fermentor
I have used glass carboys for the last 6 years and decided to try something plastic after having a near catastrophic event. I decided to try the these and have been happy with the results (though I'm only 2 batches into using them). The fermentor is nice and light but plenty rigid. Some sort of strap harness is really needed for moving it around once it is full. I have BrewHaulers that I used on my carboys, and those make carrying it easy. I'm sure the strap system they sell for the BMB works similarly well. There are some complaints out there about the univeral lid (the one with the silicon gasket, not the screw on kind) not staying in. I found this to be the case when the thing was wet. If I spray it down with StarSan or something and push it in, it pops right back out. However, if I just leave it sitting on the top for a few minutes to let things dry off a bit and push it down in it stays put without any problem. So, I don't see this as an issue. Clean up was simple. It fit perfectly on my Krausen Killer keg/carboy cleaner. I left it washing with warm PBW for about an hour and it was perfectly clean. More batches will be the real test, but so far I'm happy.
October 15, 2016
Love the ease, but the lid!!
Great fermenter, easy to clean. Lid won't stay on but I just weighed it down.
January 8, 2017
10 months ago
Oh.. the top
My purchase and the shipping all went as planned. The fermenter is awesome. The only issue is the top which I could not get to stay down when using it. It always popped up. I had to use a heavy plumbers wrench and a large "C" clamp to weigh down the lid. After I did that it worked great. Easy to clean, so no long time cleaning. The lid isn't northern brewers issue but just an issue with the design. Still really like it and glad I purchased it, just have to keep my tools around to ensure the lid stays on.
October 17, 2016
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 14 questions Browse 14 questions and 32 answers
Are these Bubbler Plastic Fermenters BPA free?
A shopper on Nov 29, 2016
BEST ANSWER: I looked on my bubbler, as well as one that is still in a box, & couldn't find anything that says it is or it isn't. Sorry.
Is there a solution for the universal lid popping out during active fermentation? Would the normal screw on lid work better during active fermentation?
joseph n on Jun 26, 2016
BEST ANSWER: flip the gasket upside down. I brewed my first batch and had the same problem couldn't get a proper seal. saw on a forum if you flip the gasket upside down if seals fine. fermenting a bourbon barrel porter right now no problems with seal.
How do these hold up to cold crashing? Will they collapse or crack?
A N on Feb 26, 2016
BEST ANSWER: Cold crashing an IPA in one of these for a week at 38F, no issues at all yet
Does the Big Mout Bubbler have volume markings?
A shopper on Jun 20, 2017
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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.
Might be dumb question but this product comes with a lid yes?
B R on Dec 27, 2015
BEST ANSWER: Yes. Comes with a lid and threaded collar. If you haven't yet, you'll probably also want to pick up a drilled stopper to accommodate an air lock
what is the hottest this carboy can get before damage occurs?
T H on Aug 2, 2016
BEST ANSWER: Temperatures over 140 F will damage these plastic fermenters, so care must be taken when cleaning them or using them. We do not recommend pouring hot wort into them in any situation. - Mike W, Northern Brewer
Does this come with the universal lid or the standard lid? Also, are people having issues with universal lid popping off on the plastic big mouths like people have observed happening in the glass versions?
J A on Jun 26, 2016

Thank you for your question. This does indeed come with the new universal lid. Anytime you have very active fermentation you can run the chance of the lid and/or bung popping out.

Will the Brew Hauler work with these? I know there is a special harness for the BMBs, but I already have several Brew Haulers and would like to avoid buying yet another carry strap... Thanks!
J K on Apr 22, 2016
BEST ANSWER: The brew hauler will work on a BMB plastic. Not as well, but well enough to avoid getting a new strap! Cheers!
I never seem to get any bubbles from my airlocks. They are always seated tighly yet still no bubbles. Must be a leak in the lid. Is there supposed to be a gasket?
R E on Jan 14, 2016
BEST ANSWER: No gasket - I've personally never had an issue with there being no bubbles. My question would be if you checked the seal before putting any wort in? I did this by putting the lid on tight, putting my blowoff hose in and trying to suck air in...I was not successful! That told me certainly enough that it had a good seal. Hope this helps.
I was told not to use plastic when brewing mead due to bacteria, is this a legit problem?
P F on Dec 23, 2015
BEST ANSWER: Plastic fermentors are suitable for any fermentation including mead. Bacteria is not a problem provided that you clean and sanitize properly and do not scratch the plastic.
A shopper on Feb 5, 2017
BEST ANSWER: It helps to settle the yeast around the perimiter of the fermenter. I will try to siphon off the top of the bubble to keep yeast to a minimum
I have a standard NB blow off tube for a standard 6.5 gallon glass Carboy. Will this fit into the opening of the lid provided?
F R on Sep 21, 2016
BEST ANSWER: Yes, the whole dimensions are the same size in this lid as they are for the standard carboys.
I have read leaving beer in secondary for a long time in plastic can be harmful. is that still the case or have these new products gotten better?
N A on Mar 24, 2016
BEST ANSWER: The main reason to use glass for secondary is that plastic vessels don't always seal quite as well as glass, and oxygen can leak in and cause staling. Of course this isn't a problem during primary fermentation, but if you're going to do a secondary, especially a long one, glass is still usually better. Using plastic raises the risk a little, but it doesn't necessarily ruin it. That said, I've used plastic for a secondary before, and I've never experienced anything negative myself.
I have the big mouth bubbler with the dual port lid and a blow off tube. I really like the whole system but I have not used the blow off tube yet because it does not give a snug fit into the dual port lid. What is the trick to get a good fit, I just don't feel comfortable with the way it fits now.
Noel J on Nov 1, 2015
BEST ANSWER: Thanks for contacting us. Tricks include having the right angle for the tube so that it is pulled by the free end to make a seal at an angle- that is how most common set ups allow for it to seal. You can also try using some teflon tape of some sort to help get it snug. The tubing will vary based on kinks temperatures and many factors. You can try putting one end in hot water and then stretching the tubing over the lid port to stretch it and then it may fit more snugly inside the tube. Since it is there to allow yeas to leave as needed and fermentation is pushing everything away nothing can get in anyway and the tubing just prevents big messes and makes cleaning up easier.

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