Description
The #9.5 Rubber Stopper with Hole is specifically sized to provide an airtight seal for standard 2000 mL (2L) Erlenmeyer flasks. Made from high-quality, food-grade rubber, it features a pre-drilled center hole designed to accommodate standard twin-bubble or 3-piece airlocks. This is the essential closure for creating yeast starters, allowing for safe CO2 venting during the propagation cycle while protecting your culture from airborne contaminants.
Brewery Tip: To ensures a perfect seal, always ensures both the stopper and the flask neck are dry before insertion. If the stopper keeps “slipping out” due to pressure, wipe the neck with a dry, sanitized cloth. Sanitize with Star San before every use. This size is precision-molded to fit the wide-mouth openings common on 2-Liter laboratory glassware.
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