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Size # 6-1/2 - Black Rubber Stopper - Solid (Qty. 1) fits all 250ml and 500ml MLS brand Erlenmeyer flasks
Black rubber Stoppers with low sulfur content. Rubber stoppers are used to close test tubes and lab glassware, such as Erlenmeyer Flasks, Florence (Boiling) Flasks, and Filtering Flasks, to prevent liquid from escaping.