Size No. 2 - Black Rubber Stopper - Solid, 1-Hole, & 2- Hole

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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. Specifications: Size: 2 Structure: Solid, 1-Hole or 2-Hole options Hole Size: 5mm Top Diameter: 20mm Bottom Diameter: 16mm Fits Flask size: 50mL- MLS Brand 50mL Erlenmeyer Flasks Show more