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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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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 gallon 6.5 gallon
SKU: U41950 U41965
Weight: 3.4 4
Height (w/lid, closed): 22" 23"
Diameter: 10" 11"
Mouth: 5.5" 5.5"
Fermentor Material: PET PET
3.9 / 5.0
59 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Great product but small leak
I love the easy cleaning of the BMB's and own quite a few. This is the first ported version I have used. It worked really well to fill a keg directly from the valve instead of having to use a siphon. 2 problems I have: 1. moving the full carboy into and out of my fermentation deep freeze I bumped the valve and had a small leak all over the bottom of my deep freeze. The plastic of the BMB is a little thin so it flexes when you hit the valve and causes a gap that beer will leak out of. 2. with an airlock in place it will not fit in my deep freeze. I don't have this problem with any other carboy from 7 gallon big mouths to 6.5 Italian glass ones.. I had to use a piece of tubing pulled thru the universal stopper into a growler filled with sanitizer. Even then when I closed the lid it was a tight fit. Besides those issues I am very happy with it especially the ease of cleaning!
March 2, 2016
Nice Fermenter – Terrible Lid
Two days ago, I used two Big Mouth Bubblers for as primary fermenters. I could not the universal lid to stay on. Finally after some web searches, I found the suggestion to turn the silicon ring around, so the wider part goes into the hole first. It’s hard to jam the lid in, but it now seals. I know this is the new, universal lid and several people had problems with the old lid design. They are great buckets, I wish the company would get the lid to seal correctly. I will not recommend the Big Mouth Bubbler to anyone until the lid is redesigned. On a positive note, Northern did a great job with customer service when I placed the order!
September 5, 2016
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
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
Overall it's good. Lid needs some work.
I like the Big Mouth bubbler. easy to clean, like the spout. The lid....the darn thing didn't want to stay on. I contacted Northern Brewer and they told me to turn the rubber gasket upside down and that seemed to do the trick. Just wish that Perhaps the lids should come that way.
January 30, 2017
3 months ago
I liked the screw top better
I like the siphonless big mouth bubblers better than buckets because I can watch the process my beer is going through and then I can use the spigot to rack for my next step. The one thing that I would prefer is the screw on lid rather than the press on universal lid because they keep popping up out of the bubbler and I've had to tape them down to keep them air tight.
February 2, 2017
3 months ago
Worth the money, but secure the lid down
The overall design of this fermenter is great. It is lightweight, easy to handle, resistant to breaking/shattering, accessible, quick to clean, and efficient to use. The lid still remains in need of improvement. Getting the lid to remain down can be a hassle. My last brew I ended up tying a string to the carrying straps or using tape after finding the lid popped out and exposing my beer. Overall I love these fermenters and have transitioned away from glass, but the lid requires a little extra attention to avoid causing concern.
October 15, 2016
Good idea
I bought the big mouth carboy because I figured it would be easier to clean than a regular carboy, and this proved to be true. Since you can get your hand down into it, it is easier to clean, and it works fine as a fermentor. I gave it 4 stars for two reasons, one, it is hard to move, hard to grab a hold of and carry. This is usually not a problem for me but because of unexpected circumstances, I had to move my fermenting wort from one location to another. The 6.5 gallon ale bucket that I was using for another batch was considerably easier to move. The second reason really wasn't it's fault. The spigot that I got did not seal properly so I has a slow leak, discovered after I put a batch in there. Luckily I was only going to have it in there for a little over a week, and it was a slow leak so I only lost about 12 ozs. Since this is the 5 gallon size, it really wouldn't work for a primary fermentor, but it is a good secondary (I replaced the spigot the second time I used it). Overall a good choice
December 27, 2015
Response from Northern Brewer
Thanks for the review! Let us know if we can help, it sounds like it has already been resolved. Cheers! James J.
November 21, 2016
Northern Brewer N
Oh the LOVE/HATE I have for thee...
PROS:1. IT'S LIGHT!2. IT's CLEAR!3. Spigot is just right to keep sediment out and you can SEE and make sure you dont catch any in your racking.4. IT's EZ 2 CLEAN!CONS:1. Plastic is TO THIN. For some temp sensitive yeasts its difficult to maintain a stable temperature when ambient is to cold.2. THEY MELT IF TO HOT!3. Seriously, you need a WORT CHILLER to use these. The Big Mouth Bubbler® (BMB) has ZERO temperature tolerance and will warp or colapse on itself if you introduce anything but room temp or chgilled wort. I thought 1H was long enough for my WORT to cool down before putting it in my BMB, NOPE!... It was just hot enough for the BMB to melt/tilt a little. Cant risk a colapse so I tossed it.. BUY ANOTHER?:Unfortunately YES! Racking is just to easy with the BMB
April 18, 2016
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Browse 14 questions Browse 14 questions and 40 answers
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.
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.
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.
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. Just hand wash it before using. The tap at the end makes transfer between primary and secondary very easy. The large mouth opening makes cleaning easy without need for any special brushes. I bought two of them. One 6.5 for primary fermentation and one 5 gallon for secondary fermentation.
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 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.
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'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

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