Big Mouth Bubbler 6.5 Gal Plastic Siphonless Fermenter with Harness

  • Big Mouth Bubbler 6.5 Gallon Plastic Siphonless Fermenter with Harness
Big Mouth Bubbler 6.5 Gallon Plastic Siphonless Fermenter with Harness Big Mouth Bubbler 6.5 Gallon Plastic Siphonless Fermenter Big Mouth Bubbler 6.5 Gallon Plastic Siphonless Fermenter's Spigot

Big Mouth Bubbler 6.5 Gal Plastic Siphonless Fermenter with Harness

SKU 42903



Product Details

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

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.

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

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.


  • Ported Big Mouth Bubbler® Plastic Fermentor
  • Universal Harness for Big Mouth Bubbler
  • Spigot
  • Single Port Universal Lid*

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

Additional Information



BIG MOUTH BUBBLER® Product Specifications:

Capacity: 5 gallon 6.5 gallon
SKU: 42904 42903
Weight: 3.4 4
Height (w/lid, closed): 22" 23"
Diameter: 10" 11"
Mouth: 5.5" 5.5"
Fermentor Material: PET PET

Customer Reviews

Based on 57 reviews
Perfect way to upgrade my kit!

Still new at homebrewing and was using a 1 gal kit. Added two 6.5 gal big mouth bubblers and am now in my second batch. they work great and I couldn't be happier. Looking forward to growing my skill set with these awesome fermenters.

Sladky J.
Best Fermentor

I purchased several different fermentors over time to include No. Brewer SS 7 gal, buckets etc. and Big Mouth Bubbler is the best for the following reasons:
1: see the fermentation at work
2: super easy to clean
3: no valve leak issues like on SS type Fermentors.

The only issue is the strap that be purchased. It’s complicated and the design isn’t really a good one.

Ryan N.
Lid and harness

My previous big mouth bubbler was great, so I bought another one when the plastic around the spigot cracked. They redesigned some features. The universal lid will not stay tight during fermentation of a low alcohol content beer, I haven’t tried a high one yet but hopefully a blowoff tube will be better than an airlock. The harness is not only difficult to figure out and put on but also a joke trying to carry when full. I prefer the older model with the twist on lid much better.

Used as a secondary

Using the 6.5 gal big mouth as a secondary fermenter for a 5 gal batch. I like that the spigot is a little more raised off the floor than my primary, hoping to pull less sludge when bottling from the spigot. Hate siphoning when bottling, because I seem to need an extra set of hands and eyes when approaching the bottom of a bucket. This setup seems like it would work great for secondary and/or primary. Quality is good. I'd bet I could probably strap-in and replel down a mountain with that harness that comes with it. Only issue... Wish I would have gotten the glass bubbler.

Steve L.
Big Mouth Bubbler 6.5 gal Plastic Siphonless Fermenter with Harness

Good just as I expected.