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Large Neoprene Stopper with One Hole - Perfect for Flasks, Beakers, and Bottles
The Large Neoprene Stopper with One Hole is a durable laboratory stopper designed for use in homeschool and classroom chemistry labs. Made from flexible neoprene, this stopper provides a secure seal while accommodating glass or plastic tubing through its pre-drilled center hole.
Its tapered design allows for a snug fit in compatible flasks and bottles, making it ideal for experiments involving gas transfer, filtration setups, or closed-system reactions. The single hole allows easy insertion of thermometers or delivery tubes while maintaining a controlled environment inside the vessel.
Product Specifications:
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Neoprene construction
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Single pre-drilled center hole
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21 mm diameter at base
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24 mm diameter at top
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28 mm height
A practical lab accessory for structured chemistry curriculum, this 10-pack of one-hole stoppers supports hands-on experimentation in homeschool programs, co-ops, and classroom laboratory settings.