Siphonless Big Mouth Bubbler® - Ported 5 Gallon Plastic Fermentor


SKU# 41435

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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.

Included: Siphonless Big Mouth Bubbler® - Ported 5 Gallon Plastic Fermentor, spigot, single-port universal lid.
Required but not included: Small Universal Stopper & airlock. Add to cart to view stoppers and airlocks.


Availability: In stock

Siphonless Big Mouth Bubbler® - Trub Closeup

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  • Siphonless Big Mouth Bubbler® - Trub Closeup
  • Siphonless Big Mouth Bubbler® - Trub Closeup
Product Details

The Siphonless Big Mouth Bubbler® Plastic 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.

The new Big Mouth Universal Lid (included) fits all Big Mouth Bubbler® Fermentors. 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. Ribbed silicone rings ensure 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 fermentor.

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

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

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

The optional Dual Port Lid allows for the use of a temperature controller probe. The ThermoStar Dual-Mode Digital Temperature Controller with optional 12" stainless probe ensures precise and repeatable fermentation temperatures!

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

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.

BIG MOUTH BUBBLER® Product Specifications:
Capacity:5 gallon6.5 gallon
Height (w/lid, closed):22"23"
Fermentor Material:PETPET
3.9 / 5.0
48 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great sihponless Big Mouth Bubbler
I have the 6.5 gallon original Big Mouth Bubbler and love it. However, I wanted to try the siphonless version, and needed a 5 Gallon for secondary anyway.Wow, I really like being able to transfer my fermented beer to bottles or kegs without disturbing the trub. It works fantastic. Cleans up just as easy as the non-ported version.Oh, and if you want room for your 5 gallon batch primary fermentation, purchase the 6.5 gallon version.
October 4, 2015
Spigot has a crack and leaks
I'm all set for my first time using this fermentor and have found that the spigot has a crack and leaks as a result. I'm so thankful I found this problem with water before I loaded it up with beer. I'll be contacting customer service first thing tomorrow morning and am hoping to have a good experience.
April 25, 2016
Response from Northern Brewer
Sorry to hear about that issue! Customer service will be contacting you to make sure we get you fixed up to the best of our ability. It is always a good idea to leak test before filling so glad to hear you caught the issue before it was a disaster. Cheers!
November 21, 2016
Northern Brewer N
This fermenter leaks!
Purchased this 5 gal Big Mouth with siphon tap a couple of months ago. I had high hopes for it. However the unit as received leaks at the bottom of the siphon. I carefully tried to hand tighten but beer still will leak around the edges of the siphon. The siphon washers as supplied do not prevent the beer from getting from the inside to outside. The leak is a very very small trickle but you can actually see the beer getting thru the washers. I believe because the plastic fermenter has thin walls that the siphon cannot seal properly. Not a good thing.
November 24, 2015
Response from Northern Brewer
Hi Harry

I'm sorry to hear that your fermenter is leaky. We want to make sure we're providing the best products to our customers and we'd be happy to work with you to improve your experience. Please let us know if you'd like to exchange your carboy or if there are other ways we can be of service.
November 21, 2016
Northern Brewer N
Best addition to my beer kit thus far!!!
This is the first time I had to use a secondary fermentation. I use a 6 gallon for the primary and this 5 gallon for the second. The valve at the bottom made making the Mustache Envy a cinch!! Plus, this is probably the cleanest beer I have ever made!!! I most definitely recommend this product!!
December 14, 2015
Great Item
This was the first time I used it and it was great and easy to use and easy to clean afterwards.
April 3, 2016
Offsetting Marcia
I have yet to use this exact product, however I have experience with the 6.5 gallon version. I am only writing this review and rating it 5 stars to offset the bad review left by Marcia, who left a bad product review based on her self-recognized ignorance of brewing.
September 9, 2015
The real Mother Loving deal
I just used my siphon less bubbler and it worked flawlessly. No siphon to sanitize. No moving of the bubbler while full of beer. I just grab my pre-sanitized keg, a tube and filled the keg. Cleanup was a cinch also. I removed the spout and washed it separately and cleaned the bubbler as usual. The big deal is you don't have to move a carboy full of beer, ever. I definitely want more of these. Oh, by the way Marcia I'll take that 5 gallon off your hands anytime. James from Texas
September 10, 2015
Love it!
I love it. It's really amazing
October 5, 2015
I like the ported BMB because it means one less instance of siphoning! Also, the wide mouth, obviously, is the best part because of how easy it makes cleaning, dry hopping, testing, etc. last, but not least, I am not scared to carry this thing around like I am with my glass carboys. Excellent product.
June 2, 2016
Excellent Product!
Have already used both the 6.5 and 5.0 gallon units and they worked without any issues. Good seal on the covers and both spigots installed easily with no leaks at all. Would definitely recommend both products!!
February 28, 2016
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 11 questions Browse 11 questions and 23 answers
What size tubing does the spigot accommodate?
K P on Nov 5, 2015
BEST ANSWER: The same as the bottling bucket I believe it 3/8" internal diameter
Newbie question: If I use this as the secondary fermentor, can it pull double-duty as a bottling "bucket" since the trub is below the spigot? I'm currently using NB's fermentor bucket and bottling bucket.
F R on Oct 15, 2015
BEST ANSWER: That should work just fine IF you are using carbonation drops directly into your bottles. But if you are using a priming solution, you will be stirring up all of the remaining trub with the beer to be bottled. That wouldn�?t be ideal. I really like using these siphonless fermentors, but I still prefer to use my bottling bucket because I can attach a dip tube in it to get every last drop into my bottles.
Is this BPA free plastic?
P J on Feb 29, 2016
BEST ANSWER: Lightweight PET made in America is free of BPA or any other contaminants. Cheers!
Does the spigot have any metal on/in it? I want to use this for kombucha but it can't have metal on it.
S G on Oct 15, 2015
BEST ANSWER: There is no metal in the spigot or anywhere else in this fermenter. I am now in secondary fermentation using the 5 gallon and used the spigot & some tubing to transfer my brew. Very easy.
Is there any hint of a plasticy smell or taste, even for very light bodied beers?
R E on Sep 14, 2016
BEST ANSWER: No I don't think so. I have made some good beer out of plastic fermenters and the big mouth bubblers are so much easier to clean. I would recommend them to anyone
I would think we would need to sanitize the spigot when transferring beer to 2nd fermentor or bottling bucket? Or is it not necessary?
E D on Jun 2, 2016
BEST ANSWER: yes you should always sanitize everything. When Sanitizing the Big Mouth before you add the beer just open up the spigot and let it run. Then when transferring to secondary or keg I spray the outside and up into the spigot as much as I can with Starsan. Sanitize the tubing and the vessel you are transferring to and you are good to go
I lost one of the two rubber washers at the spigot fitting. Is it possible to buy a replacement one?
S M on Apr 26, 2016
BEST ANSWER: Sorry, because of the cost of such small, plastic items, we only have new spigots for sale. Not sure if there are alternative sources for a similar sized gasket out there. Sorry I do not have the answer at this time. Feel free to contact customer service.
What material is it made of ?
F R on Nov 8, 2015

This particular bubbler is plastic.
I'm seeing a lot of comments about secondary fermentation, but I'm not that advanced! Can this fermenter be used for regular fermentation?
April A on Nov 23, 2016
BEST ANSWER: Not for 5-gallon batches, you need headspace to contain the krausen (foam). You could use this as a fermenter for a 3 or 3.5 gallon batch.
I just purchased one of these. The hole in the vessel for the spigot is heat cored. The melted plastic at the edge of the hole on the inside and outside made a small (0.5 mm?) ridge that made it hard to get a seal. Should this material not have been trimmed at the factory to ensure a smooth surface for contact with the rubber washers? Did anyone else have this issue, and how did you resolve it?
R H on Dec 8, 2015

It sounds like you've got a defective one. Do you think you can reach out to us directly either by calling 1-800-681-2739 or by emailing We should be able to get you fixed up. Calling might be best but either will work

Gabe from NB
What are the dimensions?
Sam K on Aug 13, 2015
BEST ANSWER: The 5 gallon is 10" in diameter and 22" tall with the lid on. The lip opening is 5.5" wide and the spigot has a 3/8" OD barb so get 3/8" ID tubing.

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