Big Mouth Bubbler® - 5 Gallon Plastic Fermenter with Harness

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Superior to a 5 gallon carboy, the 5 gallon Big Mouth Bubbler® Plastic is a virtually indestructible fermenter, 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.

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

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.


  • Big Mouth Bubbler® - 5 Gallon Plastic Fermenter
  • New Big Mouth Bubbler® Universal Lid
  • Universal Harness for Big Mouth Bubblers®

Required but not included:

    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 if dropped or knocked. 

    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)

    BIG MOUTH BUBBLER® Product Specifications:

    Capacity: 5 gallon 6.5 gallon
    SKU: 42905 42902
    Weight: 3.4 4
    Height (w/lid, closed): 22" 23"
    Diameter: 10" 11"
    Mouth: 5.5" 5.5"
    Fermentor Material: PET PET
    Lid Plate Material: HDPE HDPE
    Lid Ring Material: Nylon Nylon


    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.

    Customer Reviews

    Based on 64 reviews
    5 gallon plastic big mouth bubbler

    This is the second 5 gallon big mouth bubbler I've ordered. Using as a secondary fermenter. As this is plastic, did not need or use the harness (but the harness would absolutely be needed for the heavy glass). Universal stopper was not very pliable, and getting the air lock inserted took some effort. Wish I would have ordered the siphonless bubbler with installed spigot, but can always install one later. JW


    Big Mouth plastic fermentor is so much easier and safer to clean and handle. Going t to replace all my glass narrow mouth fermentors.

    Easy to clean

    So far everything works really well. We got these because cleaning the glass carboys out is such a pain. The only thing we don't care for is having to tighten the straps down to keep the lid on. They are a little cumbersome. We haven't tried a batch without, but would rather not risk the lid popping off and ruining a batch of beer.

    5 gallon carboy

    Rally great if you do a lot of adds in secondary. The big opening makes it super easy, also makes for easy cleaning

    Seltzer Fermenter

    I normally brew beer, but I needed a clear plastic fermenter for seltzer to monitor it's clarity. My wife and older kids are preferring the unflavored Seltzer and adding flavorings to taste. My beer fermenters are also large mouth, so this seemed like a great low cost addition. Very happy with it. The first batch of seltzer is should be done this week, and it is great to see the clarity before I keg it. I also like the cargo mess cradle with handles and the smaller air lock. The top looks like it sealed very nicely.

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    Big Mouth Bubbler® - 5 Gallon Plastic Fermenter with Harness

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