Big Mouth Bubbler® - 5 Gallon Plastic Fermentor


SKU# U41950


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Superior to a carboy, the 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.

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.

Included: Big Mouth Bubbler® - 5 Gallon Plastic Fermentor, single-port universal lid.
Required: Small Universal Stopper & airlock. Configure options below.

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Big Mouth Bubbler Plastic - 5 Gallon   +$29.99
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Big Mouth Bubbler® - 5 Gallon Plastic Fermentor

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  • Big Mouth Bubbler® - 5 Gallon Plastic Fermentor
  • Big Mouth Bubbler® - 5 Gallon Plastic Fermentor


Product Details

Superior to a carboy, the 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. Best of all, it will not shatter when dropped or knocked. 

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 ports work 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
Lid Plate Material:HDPEHDPE
Lid Ring Material:NylonNylon

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!

5 gallon fermenters are best for the secondary conditioning stage of beer fermentation. The smaller size eliminates extra airspace in the fermenter reducing the chances of oxidation which can stale the beer prematurely. Also available as a 6.5-gallon primary fermentor.
3.7 / 5.0
25 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Big Mouth Bubbler 5 Gal
I bought this one to replace my 6 gal, whose bottom cracked for no reason (while soaking, sitting on a rubber anti-fatigue mat; came back and the water was down about a third, then noticed the crack as I dumped it. But this is a review of the replacement). I like it for the same reasons I liked my 6: the big mouth allows me to dry hop or add a hop bag of cacao nibs and PB2 for my PB Cup Porter, to keep things less sludgey in the carboy. As I recall reading in the description, the 5 gal is good for secondary, which is what I use it for; it wouldn't have the headroom for a hearty primary fermentation. I have to agree with others, though, that the new lid is a problem. I tried it out, and it slowly popped up as the pressure increased; I had to replace it mid-secondary with the old top and ring from my deceased 6-gal. They need to correct this quickly, or it would be a deal breaker for any new purchases. I think if they combined the new design with those gaskets, sized it to fit such that the ring would fit over it and screw down around it like the old one, and that would resolve both the air leakage of the old cap, as well as the 'creepage' of the new cap. (IMHO)
September 14, 2016
Awesome product
Awesome product
March 13, 2016
Fine product
As always, I read the reviews about this product before I purchased it. Too many are in the 'bad' category. It almost kept me from purchasing it. The biggest issue seemed to be with the lid not sealing. Well, it's plastic. Of course you aren't going to get a solid seal without adding a few layers of plumbers tape. I have another plastic fermenter that actually said that in the instructions. Perhaps this company should include such instructions? Come on people. Stop bashing products just because they do not preform to your 100% expectations when without a very minor addition. I think this is likely a good company and I know it is a good product. I'm half way through my first batch and am very pleased.
October 3, 2015
5 gallon big mouth bubbler
Very lightweight and easy to use. Seals perfectly. Purchased the harness as well for easy pickup.
June 24, 2016
Big mouth bubbler is a must have
The big mouth bubbler is a great secondary fermenter I plan on getting a 6 gallon to replace the bucket fermenter that came with my kit
August 17, 2016
very good concept
l like this fermenter very well just complete first batch using this type. it worked good. the only thing is I wish I would have saw the no siphoning big mouth first, I would have got that first. but that what I'm gonna get next it will make a great secondary.
December 3, 2015
Love a batch in
Love a batch in it right now
January 27, 2016
Great way to ferment. After
Great way to ferment. After loosing a 6 gallon glass fermenter do to a refrigerator freezing up and splitting the glass, I will not use glass again.
July 17, 2016
Big mouth vs. regular carboy
Much easier than glass car boys.
November 3, 2015
Just About Perfect Fit & Function
For the last couple years I've been fermenting in modified 2.5 gallon glass cookie jars from my local big-box store, because I hate trying to clean carboys but want to be able to see the fermentation. The Big Mouth looked like an all-round better solution--as transparent and easy to clean as the cookie jars, but twice as big, lighter, and (on a gallons-per-dollar basis) cheaper. I picked the 5-gallon rather than the 6.5-gallon because it's a perfect fit in the lower portion of the mini-freezer that I'm using as a controlled-temperature fermentation chamber (somebody at NB must own one of these freezers).Just finished the clean-up after my first fermentation in the Big Mouth, a dry stout that blew off for three days and made quite a mess. How'd it work? Great! Contrary to some of the reviews of the 6.5-gallon version, the lid sealed just fine, the blowoff tube stayed in place, so all the mess was confined to the bucket at the end of the hose. Nice. When the blowoff ended, a standard bung and airlock fit right into place (hint, though: just like a glass carboy, the lid won't adhere to the bung if either is still wet with sanitizer solution. Let them air dry, or use a clean paper towel--or a piece of sterile gauze if you're really obsessive about sanitation--before putting the bung in the lid).But the big thing was the clean-up. My previous batch of Irish red was fermented in a standard glass carboy, with the same very enthusiastic yeast... and it took half an hour with a brush and two soaks in Oxi-Clean to get the krausen out of it. The Big Mouth cleaned up in about five minutes. Most of the krausen simply hosed off with warm water from the spray hose in my kitchen sink. Wiping with a standard dishrag cleaned up the rest (if I have any complaint about this product, it's that it doesn't come with the nifty microfiber cleaning rag that accompanies the glass ones) I had been a bit worried that crud might get stuck in the little "bubbles" molded into the sides, but they seem to be quite rounded on the inside and nothing stuck to them.So overall, I think this is a great product. It fits in my fermentation chamber, it functions well, I can see what's going on inside, and it cleans up in a snap. What more can I ask for? (well, if you must know, how about adding a 3-gallon one with the same diameter? Then I could ferment half-sized batches on the "shelf" above the refrigeration unit in that old freezer).
November 26, 2014
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Browse 6 questions Browse 6 questions and 9 answers
I have the new style "push down lid". It will not stay on "sealed". I read online that someone suggested taking the screw down component and shaving down the lip of the new lid to make a hybrid as the new lids don't stay on. Please sell the screw down pieces so we can make this modification
Tim L on Aug 30, 2016
BEST ANSWER: We do not yet have those style lids available for sale, but we are looking at this and several other options for improving the seal of these lids. Hopefully we will have something soon for you.
Can you get a solid water tight lid?
N H on Jan 22, 2016
BEST ANSWER: No, a seal is impossible. The hole is in the center of the bottom of the fermenter. Upon further investigation it appears to be a manufacturing defect as the edges are smooth and formed, not sharp and jagged.
Does this product for $29.99 come with a lid and airlock? A lid is shown in the image, but I can't tell by the product details. Thanks!
C H on Jan 14, 2016
BEST ANSWER: Hi Charlotte,

It comes with the lid, but the stopper and air lock come separately. The stopper that fits is:

And the air lock options are:

Hope that helps!


I am downsizing from 5 gallon to 2.5 3 gallon because I am retired and live by myself . Since I am, how will this work out for me? Thanks
L A on Oct 1, 2015

if you are making beer

it should work well still

just not for long term storage (3+ months) of a beer product. If you are doing simple 1-

week primaries with optional 1-

weeks secondaries

the larger vessel could still work well. I routinely start a

gallon batch in a 5 or 6 gallon wide mouth fermentor

and I usually secondary in a

gallon carboy

but I have secondaried in 5 gallons before and it works fine. I just would not let it go for very long. I hope this helps explain what situations it works well for!
Can you lager in a plastic big mouth bubbler?
D A on Nov 28, 2015

plastic big mouths are suitable for lagering.
How can I seal the lid? It keeps popping up.
A shopper on Feb 1, 2017

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