Rubber Stopper, #9, solid

This 1000ml PYREX narrow mouth Erlenmeyer flask with a heavy duty rim is made from low expansion, Type 1, Class A borosilicate glass that can be heated directly in an open flame.

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These #10 rubber stoppers are 42-50 mm diameter with no holes. #10 rubber stoppers fit 2000 ml Erlenmeyer flasks and many thermos vacuum bottles.

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These large 1000 ml Home Science Tools Erlenmeyer flasks are made of high-quality borosilicate glass that can be heated directly in an open flame.

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These #8 rubber stoppers are 33-41 mm diameter.

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These 2000 ml Home Science Tools Erlenmeyer flasks are made of high-quality borosilicate glass that can be heated directly in an open flame.

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Discover Earth's intricate water cycle in this Accelerate Level (Grades 3-7) Earth and Space Kit. Your student will take a deep dive into the water cycle, turn salt water into fresh water and experiment with erosion.

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These 500 ml Home Science Tools filtering flasks are made of high-quality borosilicate glass that can be heated directly in an open flame.

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These #6.5 rubber stoppers are 27-34 mm diameter with one 5 mm diameter hole.

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These #10 rubber stoppers are 42-50 mm diameter with one 5 mm diameter hole.

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Rests on ring support to hold glassware above a burner.

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