You are shopping Northern Brewer US shopping site, to view our Canadian shopping site - Click Here

Siphonless Big Mouth Bubbler® - Ported 5 Gallon Plastic Fermentor


SKU# 41435

Standard Shipping Rates Apply to this product

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

More Views

  • Siphonless Big Mouth Bubbler®
  • Siphonless Big Mouth Bubbler® - Lid
  • Siphonless Big Mouth Bubbler® - Turb 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
87 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
big mouth bubbler
works great, easy to clean, siphonless no heavy lifting
March 30, 2018
1 month ago
Advice for sales
The BMB was as advertised. I think that a stopper and airlock should be included or more clearly stated that it is needed when buying.
March 20, 2018
2 months ago
Makes bottling so much easier and faster. Much lighter when moving than the 6.5 gallon big mouth bubbler.
March 14, 2018
3 months ago
Great idea ,poor r&d with the lid
When installing the lid the lid eases itself back up out of the fermenter loosing the seal (presently have a weight on it holding it down).The fermenter has threads on the top of it for a screw on lid , not sure why that design isn't being utilized I should have looked at the reviews before purchasing . I hope this helps someone else before they make the mistake . Sorry northern brewer thumbs down on this pos .
March 3, 2018
2 months ago
Love my BMB!
I love my big mouth bubbler. Makes dry hopping and cleaning a breeze, and being able to empty without siphoning to my bottling bucket is so much easier. Would have given it 5 stars but the lid just won’t stay on no matter what, wet or dry. Easy fix was to put a 10lb freeweight on top of it, but had to take a star away for that because it really is a fixable annoyance.
February 4, 2018
3 months ago
Great Fermentor, No lid issues
I am using this for 2-3 gallon batches. No issues with the lid that others have mentioned. The siphon-less spout is priceless! Makes the bottling day 10x easier.
December 13, 2017
6 months ago
Big mouth bubbler
Going to use it tomorrow. Quality is good, size is good, I bought two. I'll ferment in one for a week or so and then use the spigot valve and a piece of tubing to gravity drain into the secondary for another week or so. I also bought your temp controller and heat wrap. I mostly do lagers. This will be a smoked Porter.
December 8, 2017
4 months ago
Way better than glass
I bought plastic big mouth bubblers with port after breaking both of my glass carboys. I really like the large opening... the reduced weight and not needing to siphon. I too have trouble with keeping the lids on but have starting putting a strip of tape across the top.
New batch of Brickwarmer ale. Using temp controller with heat blanket.
New batch of Brickwarmer ale. Using temp controller with heat blanket.
December 4, 2017
5 months ago
disappointed with lid design
We bought this thinking it would be so much easier to clean than a standard carboy. Sadly, we had the same experience as many others and the lid just doesn't stay on. Made a big mess and probably ruined the batch of beer.
December 1, 2017
Good for bottling but be careful using for fermentation is not air tight.
November 28, 2017
5 months ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 18 questions Browse 18 questions and 62 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
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.
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 there any hint of a plasticy smell or taste, even for very light bodied beers?
R E on Sep 14, 2016
BEST ANSWER: I have used mine on several light bodied beers and have not noticed any plasticy smell or taste. One thing I did learn though is that if you put any additives in at re-rack they can get stuck in the spigot. I had that happen with some vanilla beans I added to a stout. Some smaller pieces got stuck during bottling and was difficult getting them out.
Can I use this as a secondary fermentor for 5 gallon batches? Sorry for a dumb question but I'm a newbie
Brad B on Dec 29, 2016
BEST ANSWER: I use Siphonless Big Mouth Bubbler's for both primary and secondary. I do exclusively extract kits and would highly recommend using 6 gallon for primary and 5 gallon for secondary. This has worked for me and I learned the hard way that using a 5 gallon bubbler for primary is a risk not worth taking. I started 2 years ago and have made over 30 batches and this seems to work just fine.
Does the Big Mout Bubbler have volume markings?
A shopper on Jun 20, 2017
Siphonless Big Mouth Bubbler® - Ported 5 Gallon Plastic Fermentor
Siphonless Big Mouth Bubbler® - Ported 5 Gallon Plastic Fermentor
Big Mouth Bubbler Plastic - 5 Gallon
Big Mouth Bubbler Plastic - 5 Gallon
Big Mouth Bubbler® EVO 2 - 5 Gallon Glass Fermentor
Big Mouth Bubbler® EVO 2 - 5 Gallon Glass Fermentor
Big Mouth Bubbler® EVO 2 - 6.5 Gallon Glass Fermentor
Big Mouth Bubbler® EVO 2 - 6.5 Gallon Glass Fermentor
Big Mouth Bubbler® EVO 2 - Siphonless 6.5 Gallon Glass Fermentor
Big Mouth Bubbler® EVO 2 - Siphonless 6.5 Gallon Glass Fermentor
Siphonless Big Mouth Bubbler® - Ported 6.5 Gallon Plastic Fermentor
Siphonless Big Mouth Bubbler® - Ported 6.5 Gallon Plastic Fermentor
Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor
Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor
Big Mouth Bubbler® - 5 Gallon Plastic Fermentor
Big Mouth Bubbler® - 5 Gallon Plastic Fermentor
BEST ANSWER: Yes, the Big Mouth Bubbler Plastic does have indentations as markings but does not have numbers 1 - 5 or .
You have to count them to determine at what level you are at.
Is the 5 gallon big mouth bubbler big enough to ferment a 5 gallon batch of beer?
A shopper on Dec 13, 2016
BEST ANSWER: Yes, but I recommend you use a 6 gallon for primary fermentation and a 5 gallon for secondary. After primary fermentation you are going to have a bunch of sediment on the bottom so it's usually a good idea to use a bit more than 5 gallons to start if you want to end up with a full 5 gallon batch when it's time to bottle or keg.
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.
Can this be used on small 1 or 2.5 gallon batches?
A shopper on Mar 14, 2018
BEST ANSWER: It seems it could be used for small batches but there will be a lot of airspace in the carboy which is generally considered unfavorable due to higher risk of oxidation. But don't worrry, do it anyway and enjoy your homebrew!
Does the harness still work on this model? Seems like the port on the side sits exactly where the harness strap normally goes
A shopper on May 15, 2017
BEST ANSWER: Yes the harness will fit if you start by getting the harness over the port first, then move over to the other side and firmly pull the strap over the other end of the bottom. It may seem a little tight, but I always put the harness on the spout end first before racking any wort into the fermentor.
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
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!
My universal lid won't seal properly and will pop off if I don't tape it down. I have reset the gasket a few times, risking contamination of my beer, but nothing works. Did the new lids get tested before they went into production? And can we have the old lids back?
A shopper on Jan 13, 2018
BEST ANSWER: Thanks for contacting Northern Brewer. I understand you do not like the universal lid. At this time, this is the only lid we sell. We used to sell the screw on type however, there were some issues with the original design, which is why we created this lid. Despite your feelings towards it, it is a much better design, however it does behave a little differently. As you may know, it's held in place by a silicone gasket, if that gasket is wet, or slippery with Star San, it will slide up sometimes. We've found if you give it 15 minutes and allow it to dry it will hold in place better. We have also found if you invert the gasket, so the widest part of the gasket is facing down towards the Big Mouth Bubbler instead of up towards the lid, it makes it a little more challenging to wiggle on, but it does hold in place much better. The ability to pop up if there is a lot of pressure is a safety feature, so even it the smallest ring of the gasket is sealing the carboy, but allowing to release pressure. During active fermentation this is a good thing and can help avoid explosive blow-offs. Cheers!
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 brewmaster@northernbrewer.com? 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.
I have been thinking about ordering the new Depth Charge for the Big Mouth Bubbler - looks like a great product. Will the Depth Charge work for the ported 5 gallon Big Mouth Bubbler?
A shopper on Nov 24, 2016

You may also be interested in:

Please wait...

Your selected product has been added to your Cart.
Continue shopping
View cart & checkout