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"
- Details & Instructions
Best Fit 6 Gallon Carboy Bottom Diam. 1 1/8"
3.0 / 5.02 ReviewsNo problems with this bong fit just right the way it should.November 4, 2017Purchased
10 months agoRubber Stopper is Too Small!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.June 6, 2018Purchased
3 months agoResponse from Midwest SuppliesI'm sorry to hear about your issues with the stopper and Big Mouth Bubbler. The 6.5 stopper is one of the 2 stopper options we suggest for the Big Mouth Bubbler. A member of our customer service team will be reaching out to you shortly.June 11, 2018Greggory G
- Customer Q&A