Pure laboratory-grade stoppers are odorless. #10 Size fits Better Bottle™ PET Carboys (all sizes) and other 1.75" openings, including FerMonster Fermenters. Drilled to fit any airlock.
Oct 13, 2019 by Bob
Q: What size stopper will I need for the 3 piece airlock? I need to order the airlock, however not sure if the stopper comes with it.
A: All our stoppers with holes fit all our airlocks. A stopper does not come with airlock purchase.
Tight fit for 3 gallon carboy
Sits tight, sealed well but got some staining from overflow and yeast - staining won't get away.
stopper w/h hole
works like any other stopper with hole.
Not exact fit
Keeps popping out the carboy instantly if I push it down accurately. If I push harder, it goes either completely flush with the opening or, worse, down into the bottle itself. I had to use awl to extract this stopper multiple times. I guess the width is OK, but the height has to be twice what it is right now for it to sit firmly in the bottle's opening and still stick out at least a little.
Good quality and does the job
Had one of these for years to plug the carboy, no issues with it falling apart or anything like that. Simple and effective.
Works great for Better Bottles
Pros: Works just fine for Better Bottles...and priced much nicer than the actual Better Bottles stopper.
Cons: No fancy bells & whistles. Just what you'd expect for $2!