Drilled gum rubber stopper. Used to provide a positive seal on fermentors. Drilled hole is compatible with standard airlocks.
The #6.5 stopper works well with our glass carboys and Big Mouth Bubbler PET fermentor.
Top Diameter: 1.339"
Bottom Diameter: 1.063"
Customer ReviewsWrite a review
Worked OK in 5 gallon glass carboys but too small for 3 gallon glass carboys. Will go back to using No.7's for both and use these for backup's
No I actually do not like this stopper at all; it's too small for my Big Mouth Bubbler. Did I order the wrong one or did you send me the wrong one? The other 2 I received are much better and work perfectly. Too much of a hassle to return it, not worth the shipping cost and trip to the post office.
No problems with this bong fit just right the way it should.