This is a standard #6.5 solid stopper. The bottom has a diameter of 1 1/8 inches, with a top diameter of 1 3/8 inches. This stopper will fit standard 1 gallon glass jugs, as well as standard 3, 5, 6 and 6.5 gallon glass carboys. If one of your projects calls for a stopper this size, we have the solid stopper you need!
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