Rubber Stopper, #9, 2-hole

42-50 mm diameter. Fits many vacuum bottles.

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These #8 rubber stoppers are 33-41 mm diameter with one 5 mm diameter hole.

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Section of bone showing marrow with Haversian canal structure.

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Liebig condensers are used to cool and condense hot vapor as part of a distillation apparatus.

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These # 6.5 rubber stoppers are 27-34 mm diameter with two 5 mm diameter holes.

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These #8 rubber stoppers are 33-41 mm diameter with two 5 mm diameter holes.

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These #5 rubber stoppers are 23-27 mm diameter with two 5 mm diameter holes. No. 5 rubber stoppers fit Pyrex 125 ml Erlenmeyer flasks.

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Show off your flower, sea shell, and insect collections with Riker Mount Display cases. Each is filled with batting and comes with a glass cover.

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Enhance your student's science and engage them in Earth & Space science with this hands-on, inspiring kit. Discover stars, constellations, weather vs. climate, and erosion. Learn about pollution, oil spills, and their effects on the earth.

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Discover chemistry as your student Accelerates to a new level. This school year includes detailed teacher guides, full-color student workbooks, and experiment supplies. Study thermal energy, matter, mass, and more.

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