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Siphonless 6.5 Gal. Big Mouth Bubbler® - Ported Plastic Fermentor

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Siphonless 6.5 Gal. Big Mouth Bubbler® - Ported Plastic Fermentor

SKU: 41436

The most helpful fermentor ever invented just got even better. Less effort. Better, clearer beer. Don’t just cut out the hassle of cleaning, cut out siphoning altogether! Porting this revolutionary fermentor makes transferring as easy as the turn of a valve. No extra equipment, no extra cleaning, just a sanitized fermentor.

  • Ported Big Mouth Bubbler® Plastic Fermentor
  • Spigot
  • Single Port Lid

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The most helpful fermentor ever invented just got even better. Less effort. Better, clearer beer. Don’t just cut out the hassle of cleaning, cut out siphoning altogether! Porting this revolutionary fermentor makes transferring as easy as the turn of a valve. No extra equipment, no extra cleaning, just a sanitized fermentor.

The Siphonless Big Mouth Bubbler® isn’t just easier to use. It’s better for your beer. Fight oxidation and contamination by keeping your fermentor closed for transfers. Never open the lid to insert an auto-siphon, just turn a valve and you’re set. Best of all, you’ll have clearer beer. Gently rack liquid from the spout into secondary without disturbing the trub.

Make your brew day easier and your beer better with the siphonless Big Mouth Bubbler®.


  • Ported Big Mouth Bubbler® Plastic Fermentor
  • Spigot
  • Single Port Universal Lid*
*The new Big Mouth Universal Lid (included) fits all Big Mouth Bubbler® Fermentors, and has ribbed silicone rings ensure a completely air-tight seal.

You may also need:

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
Details & Instructions

Additional Information

4.0 / 5.0
160 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Impressed with the practicality
Excellent product for transferring liquid from one container to another, making racking a Flawless and trouble free process
January 5, 2019
2 months ago
Siphonless 6.5 Gal. Big Mouth Bubbler
I already had a plastic Big Mouth Bubbler, and I really liked it. I wish they would go back to the threaded lid, but other than that it's great. I was worried that the spigot would leak, but so far it has given me no issues. I did purchase more already.
January 3, 2019
2 months ago
great design, thin-ish plastic
I have a few glass carboys and a fast ferment conical fermentor. This design is my favorite by far. I like the wide open mouth. It allows cleaning to be much easier and putting other additives inside as well easily. I likely will not buy another plastic model. I would suggest getting the glass version. I put some hot liquid in this and it started to warp. That of course makes sense, but I don't have as much of an issue with that in other types of plastic. Since I intend to continue placing hot liquids in my fermentors, I will purchase glass models in the future. The straps you can place around it help a bit for moment, but it still seems a little weak in my opinion. If the cost difference is really a factor for you, or if you want to buy a whole bunch of them, I think it's probably OK depending on your intent. I would just suggest spending the extra money for the glass model.
January 2, 2019
2 months ago
Better plastic fermenter
I like how I can reach inside to clean with a soft cloth and not using a brush to scratch the plastic.
December 31, 2018
2 months ago
So convenient to use! And no siphoning! Highly recommend.
December 24, 2018
3 months ago
I like that the Bubbler is very light weight, easy to lift and move around and with the spigot I used it as secondary fermenter and
bottling bucket.
December 3, 2018
8 months ago
6.5 Big Mouth Bubbler
This is an excellent fermentor, however it is bulky and therefore difficult to move once filled with brewing mix. I recommend informing future users to make sure it is placed wherever it will be out-of-the-way throughout the brewing process.
November 26, 2018
3 months ago
siphonless big mouth bubbler
makes bottling breezes
November 22, 2018
3 months ago
It would be great -if the lid stayed sealed.
I'm continually surprised by companies that make products that they seem to have not ever tested before they released them. The Bubbler makes sense on so many levels with the wide mouth and the built in spigot. However the lid does not stay sealed. In fact if it is the least bit wet when you put it on, it will pop up within 30 seconds or so. I have read that the lid has to be dry. So I get that I have to add two more steps to my brew day 1) sanitize the lid and set it to dry and 2) clean the area the lid touches after I rack the beer into the Bubbler (because you inevitable get some beer on the top of the Bubbler) and then let that dry too. All of this could be solved with a lid clamping system, or better yet a simple screw on lid (keeping the same silicone seals).

Now it's a different story entirely for Kombucha where you don't need a lid at all! For Kombucha I'd highly recommend it.
November 19, 2018
I installed the valve pretty tight, and filled with grape concentrate. It leaked. I don’t trust it.... not sure how tight to install it.
November 3, 2018
4 months ago
Customer Q&A
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Browse 18 questions Browse 18 questions and 57 answers
Are there marks on the Big Mouth to indicate gallons, similar to the fermentor buckets?
J R on May 10, 2016
BEST ANSWER: The Big Mouth Bubbler has a line to mark each gallon of volume.
kombucha question, is this plastic stable to the low pH of kombucha fermentations
A shopper on Feb 14, 2017
BEST ANSWER: The Plastic is Food Grade PET and will hold up to any pH level reached during fermentation.
What size tubing fits the spigot?
Roger V on Jul 15, 2016
BEST ANSWER: The 3/8" ID Siphon Hose fits it.
What is the overall footprint (including spigot) for this? I'm building a cabinet for my fermentors and I'm trying to find out how much space this will take up.
Patrick W on Jan 4, 2016
BEST ANSWER: 11" bottom and 12 3/4" front of spigot to back.
How is spigot sanitized to drain beer after fermentation?
A shopper on Nov 25, 2016
BEST ANSWER: I assume you want to bottle the primed beer using the spout but are worried it might be contaminated.
Just flow a few ounces of brew thru it to flush it out before bottling.
Or your first bottle is the only one that MIGHT get contaminated.
A shopper on May 7, 2017
BEST ANSWER: The are no handles on the vessel. Like the glass carboys, which are much heavier, I carry the "big mouth bubbler" with two hands gripping the bottom and pressing it against my body for stability.
The lid staying on seems to be a common theme in these. A shame really since I wanted to get out of a bucket.
Has this been addressed/corrected yet?
A shopper on Mar 9, 2017
BEST ANSWER: fermentation don't have that problem because I have the hard plastic screw on lid. Though a friend has what you are talking about. We use our big mouth only for 1st and second step fermentation, degasing, stabilizing and clarification and bottling. The big mouth is really great when you have wine skins, I leave them in the wine until I degas.

As for fermentation, our solution for first stage fermentation is to not use the lid and bung or air lock. We have been using a clean paper towel and attaching with a rubber band, allows co2 to escape and nothing gets in your wine. When the wine gets down to 1.02 to 1.01 (second stage fermentation. We secure top along with a bung and air lock. Works well and no problems with the lid being pushed up by the co2 gasses. I hope this helps you. Mike
Can the Siphonless 6.5 Gal Big Mouth Bubbler be used for Wine?
A shopper on Jan 12, 2018
BEST ANSWER: Yes, you could. The only problem is that most wine kits are for 5 gallons and then you have too much head space. In hindsight I would not have bought it. Should be ok if you make your own wine from fruit though.
I got one of these in May of last year; will it work with the Depth Charge or is the EVO 1/2-thing an issue? Thank you.
A shopper on Mar 23, 2017
Siphonless 6.5 Gal. Big Mouth Bubbler® - Ported Plastic Fermentor
Siphonless 6.5 Gal. Big Mouth Bubbler® - Ported Plastic Fermentor
Big Mouth Bubbler® Depth Charge™
Big Mouth Bubbler® Depth Charge™
BEST ANSWER: The depth charger will work with either the plastic or glass BMB as long as you have the lid that came with the depth charger as it's different than the standard lid on the bmb.
They seem to have an embossed design. Does this make them harder to clean?
Robert H on Jan 20, 2016
BEST ANSWER: The Big Mouth Bubbler has "bubble" surrounding the plastic jug. The logo is a sticker on the outside of the jug.

I have used them for both primary and secondary fermenters and I have not had any problems cleaning them.

My habit is to rack from primary to secondary and then immediately clean out the primary. I start by adding water and swirling the jug to loosen up the trub in the bottom.

After cleaning out the trub I then put a little dish soap in the jug and then use a dish scrubbing brush to clean the interior of the jug. Then I rinse it out really well and finally slosh the inside with StarSan sterilizer.

So far I have brewed over 6 beers and 2 ciders this way and haven't had any issues with clean up. It is super easy.

Hope that helps.
Is it a screw on lid ?
A shopper on Apr 7, 2018
BEST ANSWER: You have the option of purchasing the screw-on or the press-on- I have both, used both, both are excellent. Press-on more user friendly.
Will the little big mouth bubbler threaded screw down lid work on this unit in lieu of the universal lid?
A shopper on Dec 12, 2017

The outer diameter of our Big Mouth Bubblers is no longer regulated, so there is no guarantees that the screw type lid will work with any other Big Mouth Bubbler.
Can this be used in wine making?
A shopper on Jul 31, 2017
BEST ANSWER: Yes. I have made multiple batches with the siphonless bubbler. It also works well to use to fill your bottles after racking the wine over from the secondary bubbler.
Wanted to use for wine making, is there a way to release pressure?
K A on Aug 7, 2016
BEST ANSWER: The top of the carboy has a lid with a hole for a stopper; a person can remove the stopper and airlock from the lid when you are transferring the liquid out of the carboy via the spigot on the side. If it is not removed, when a person began transferring the liquid out it could draw the liquid from the airlock back into the carboy, this should be avoided. - Mike W, Midwest Supplies
It would be helpful to know the dimensions of the 6.5 gal bubbler particularly the height! I might be interested in the sale if it would fit into my fermentation cooler
B M on Aug 7, 2016
BEST ANSWER: It is just under 23" without a stopper or bubbler. That's to the top of the lid from the floor, outside measurement. I ferment in a former mini-fridge keggerator and it fits fine. I use a stopper, hose and a blowoff bottle, not a bubbler.
The previous answer to a similar question was cut off. The spigot is above trubb line? So u can transfer to keg/bottling bucket without siphoning?
Ernest D on Jul 12, 2016
BEST ANSWER: That's the idea! The settled sediment will be below the spigot level, so that you can then gently pour the beer out from the spigot to another vessel, via some plastic tubing stuck onto the spigot. - Mike W, Midwest Supplies
Are there also marks for in liters? A lot of malt extracts use liters. Cooper, Mr. Beer, Munton's, and Black Rock.
J I on Jun 25, 2016
BEST ANSWER: Sorry, there are no graduation marks for liters, but it would be easy to add them with a sharpie.
You are always going to lose some beer to the trub, but the spigot is above the trub line. How much beer is lost after transfer, assuming you are not tipping the fermentor. Or more precisely, if the fermentor is filled to the 5.5 gallon mark, how much beer would actually be transferred out into the keg?
W A on Feb 10, 2016
BEST ANSWER: You'll leave about 2/3 of a gallon behind. So, at the 5.5 gallon mark, you'll get a little less than 5 gallons out.

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