These drilled stoppers are made from laboratory grade gum and feature a 3/8" hole in the center that fits a standard airlock. Food grade rubber stoppers come in a wide variety of sizes and work with glass carboys, PET plastic fermentors, and other fermenting vessels. The rubber material grips both plastic and glass and resists slipping out of your fermentor. Find the right size stopper and you can turn just about anything into a fermentor!
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