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Medium Universal Stopper - Drilled


SKU# 40490

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Plastic bung with a drilled hole for airlocks. This universal style has a longer taper than rubber stoppers, for a snug fit and better seal. Fits plastic carboys, Better Bottles and Bubbler PET fermentors. This bung is too large for the Big Mouth Bubbler® universal lid.

Top Diameter: 2.375"

Bottom Diameter: 1.656"


Availability: In stock

Drilled Bung for Plastic Carboys

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  • Drilled Bung for Plastic Carboys
Product Details

Universal bungs have a longer taper than standard rubber stoppers, for snugger fit and better seal—plus a lip that prevents the bung from falling into carboy. The drilled hole fits an airlock (#7008 or #7010) for fermentation.

This universal bung will work with plastic carboys, Better Bottles and Bubbler PET fermentors. This bung is too large for the Big Mouth Bubbler® universal lid.

Top Diameter: 2.375"

Bottom Diameter: 1.656"

Not sure if this is the correct stopper for your purposes? Consult our stopper information table below:

Stopper TypeCompatible With:
No. 2 Drilled StopperStandard Beer bottles
No. 5 Drilled StopperBig Mouth Bubbler® EVO 2 w/screw-on lid (older EVO 2 models) & Little BMB
No. 6 Stopper Drilled or Solid1 Gallon Jugs
No. 6.5 Stopper Drilled or SolidGlass carboys, Big Mouth Bubbler® plastic (5 or 6.5 gallon) or EVO 2 w/ Universal Lid. Ideal fit is 6 gallon carboy.
No. 7 Drilled Stopper5 Gallon glass carboys
No. 10 Drilled StopperBubbler® 5 or 6 gallon
Small Universal Stopper - Drilled or SolidGlass Carboys (3, 5, 6, 6.5), Big Mouth Bubbler® Plastic 5 or 6.5 gallon or EVO 2 w/ Universal Lid.
Medium Universal Stopper - Drilled or SolidBubbler® 5 or 6 gallon
Additional Information
Support Documents:No
4.6 / 5.0
19 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Fits my PET carboys that have a 42mm opening perfect, pushes about half way in to make nice snug seal.
August 24, 2017
8 months ago
The best stopper
Fits my PET carboy perfectly and is easy to remove
April 22, 2017
1 year ago
Medium Universal Stopper
It does the job and does it well.
May 18, 2016
Just what I needed
Excellent service as usual.
April 18, 2016
It fits
only writing this review so that N.B. stops asking me to write a review for this every other day. It is a stopper. It fits. It does it's job. Yay beer!
March 28, 2016
As expected
Juat what I wanted
January 9, 2016
I love the stopper I recently bought online at Northern Brewer! Fits perfect :)
December 15, 2015
stopper are to large should have incremental size not small medium large
I have picked up in the past large stoppers thinking these were right .your mediums I expected to be proper size there are large and if you treat should give a dimension
October 10, 2015
It works!
Did the job just fine!
January 16, 2014
Works Fine
Works fine with Bubbler. No issues. Easy to clean as well.
January 7, 2014
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 2 questions Browse 2 questions and 2 answers
My plastic carboys have almost the same size opening as the bottom diameter of these stoppers, 1.68", are they flexible enough to fit well?? Thanks!
jesse k on Aug 15, 2017
BEST ANSWER: Yes, I use it on a 5 gallon water jug. It fits just fine.
Will this fit the 1000 ml Erlenmeyer flask since the site doesn't offer the recommended no 8.5 stopper?
A shopper on Jun 23, 2017
BEST ANSWER: The small universal stopper is the item that will fit in our 1000 mL Erlenmeyers.

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