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Siphonless Big Mouth Bubbler® - 6.5 Gallon Plastic Fermenter with Harness

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Product details

The most helpful fermenter 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 fermenter makes transferring as easy as the turn of a valve. No extra equipment, no extra cleaning, just a sanitized fermenter.

Now Includes the Big Mouth Bubbler® carrying harness for lifting, transporting and ensuring your Big Mouth Bubbler lid stays firmly in place during even the most intense fermentations.


  • Siphonless Big Mouth Bubbler® - Ported 6.5 Gallon Plastic Fermenter
  • Spigot
  • New Big Mouth Bubbler® Universal Lid
  • Universal Harness for Big Mouth Bubblers®

Required but not included:

The Siphonless Big Mouth Bubbler® Plastic fermenter isn't just easier to use. It's better for your beer. Fight oxidation and contamination by keeping your fermenter 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®.

The new Big Mouth Bubbler® Universal Lid fits all Big Mouth Bubbler® Fermenters. 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. Removable ribbed silicone ring ensures 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 fermenter.

Lid ports work with our Small Universal Stopper or a standard 6.5 rubber stopper.

Additional information



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

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

BIG MOUTH BUBBLER® Product Specifications:

Capacity: 5 gallon 6.5 gallon
SKU: 42905 42903
Weight: 3.4 4
Height (w/lid, closed): 22" 23"
Diameter: 10" 11"
Mouth: 5.5" 5.5"
Fermenter Material: PET PET

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.

Customer Reviews

Based on 510 reviews
Love the plastic, no more worries.

I’ve broken to many glass bubblers, so I love, love, love, the plastic . . . One less thing to worry about on brew day. No siphoning make transferring simple and easy.

Great fermenters... love the spigot

These are great fermenters. Easy to clean (because of the big mouth). Easy to see whats going on inside (as apposed to food buckets), and easy to transfer fermented beer. (the spigot). No more siphon starting. :-) I now own three, and may buy one more.

Great product.

I've used it for a couple of fermentations and so far I find it's a big improvement over the glass carboy. Easier to fill, easier to rack to secondary (no siphon), gunk stays in the bottom rather than being siphoned over to secondary, lighter to carry, won't shatter if you drop it, easier to clean. All around great product.

Good Fermenter, Harness Not Impressive

Having the big mouth and the stopcock are great, much easier to transfer wort/beer and clean. The harness seems to be an adaptation of a carboy harness, so the balance with the Big Mouth is precarious (shape and size are a little different). It does make it easier to lift and move 5gals of wort/beer, so not complaining, too much.

Siphon-less is the way to go

This is my 2nd Big Mouth 6.5 Gallon Plastic Fermenter. The first was not siphon-less. I liked the siphon-less aspect of my 2nd fermenter so much, I purchased another spicket & now both are siphon-less. Extremely easy for gravity flow transfer of wine. Great addition.

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Siphonless Big Mouth Bubbler® - 6.5 Gallon Plastic Fermenter with Harness

Siphonless Big Mouth Bubbler® - 6.5 Gallon Plastic Fermenter with Harness