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Size No. 1 - Black Rubber Stopper - 1 Hole (Qty. 1)
Laboratory Grade Rubber Stoppers
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.
Structure: 1 Hole
Hole Size: 5mm
Top Diameter: 19mm
Bottom Diameter: 14mm
Fits Flask size: 50mL