Rubber Stoppers
grabcad
A range of solid rubber stoppers from #000 to #16 is available, all in metric sizes. The models don't have pre-drilled holes as requirements differ based on usage. Typically, chem stoppers feature a 5mm hole, while #000, #00, and #0 use 3mm, and #1 has a 4mm hole. Brewing supply shops often drill out stoppers with a 9mm hole to fit various air locks and equipment.
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