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

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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 487 reviews
So far so good!

My first batch has been in primary for about 2 weeks. No leaks around the spicket! Very easy to clean.

second big mouth bubbler not sure about the harness

not sure about the harness being a mandatory part of the purchase, I believe it is to address the lid adhesion problem, on my original b.b.. I use packing tape to hold the lid down, kind of a mickey mouse way, but it works, and my beer is good, the ease of cleanup and racking through the spout makes it worth it for a second purchase, it also fits nicely into my fermentation chamber, ( a small modified refrigerator with inkbird)

Great product

Ordered two and packed them in 2 suitcases and took them to my home in Ecuador. they were tough enough to not get damaged in transit, which is saying something. The cover and spigot are good quality and I was impressed with the placement of the spigot outlet relative to the spigot size. The outlet is just above where the yeast settles out and the spigot will not touch the ground when installed. They thought this out pretty well I think. The carrying harness is very nicely made but I am not 100% sure I have it attached right. Could use some instructions there. Overall very happy with the product.


A 5 star product.


It looks great. Exactly what I expected. I have not used it yet, but am looking forward to easy fermentation and transfer!

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

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