This is a standard #10 solid stopper. The bottom has a diameter of 1 5/8 inches, with a top diameter of 1 15/16 inches. This stopper will fit standard plastic carboys from Better Bottle and The Vintage Shop, as well as standard 5 and 15 gallon barrels. If one of your projects calls for a stopper this size, we have the solid stopper you need!
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