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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.
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.
Had one of these for years to plug the carboy, no issues with it falling apart or anything like that. Simple and effective.
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!
Pros: Good fit for water bottles. Cons: n/a