Fits 1" openings, including older Siphonless Fermenter lids with 1" holes (does not fit current Siphonless Fermenter lid). Drilled to fit any standard airlock.
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Dec 08, 2017 by Judy
Q: What are the actual top and bottom diameter measurements for this stopper?
A: 7/8" wide at the bottom, 1 1/16" wide at the top.
