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This Universal Rubber Stopper is made with a taper and of a different material than the rubber gum stopper so that it fits multiple sizes of carboys and does not pop out when wet. It also has a lip around the top so it won’t push into the carboy either. Medium fits most PET plastic carboys.
BPA free and made out of silicone. Maximum Temperature: 180°C (356°F).
Diameter at Top: 1.0625″
Diameter at Bottom: 1.6875″
