#6.5 Drilled Rubber Stopper Bung

This fits my one gallon growler from a local brewery perfectly and the airlock is snug too. This company is so awesome I would recommend to everyone I know. The products are of equal quality but less expensive than many other homebrew sites. Shipping was also inexpensive and extremely fast! I once reached out to customer service via email and the response was very prompt & helpful. Love this company, I will be getting all of my supplies from here.

These stoppers seem to either be too slick, or too tapered. The stopper gets pushed out of the fermenter before the pressure is high enough to make the airlock bubble. Not too terrible, as yet they have never blown out completely, just enough to let gas seep past instead of bubbling. Still...

I enjoy getting something that I expect. These days that doesn't always happen when you order something online. These were quality products and worked well.