Rubber Stopper, #8, 2-hole

42-50 mm diameter. Fits many vacuum bottles.

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

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This Erupting Cross-Section Volcano Model from Learning Resources will blow your child away and help get him or her fired up about science.

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#7 rubber stopper with two 5mm holes.

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A 500 ml PYREX brand narrow mouth Erlenmeyer flask with a heavy-duty rim. This high-quality flask is made from low expansion, Type 1, Class A borosilicate glass & is used in professional laboratories throughout the world!

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These #3 rubber stoppers are 18-24 mm diameter. #3 rubber stoppers fit liter soda bottles.

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These 500 ml HST Erlenmeyer flasks are made of high-quality borosilicate glass that can be heated directly in an open flame.

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These No. 2 rubber stoppers are 16-20 mm diameter with two 3 mm diameter holes.

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5mm glass tubes fit in all rubber stoppers & attach to 4.8 mm plastic or rubber tubing.

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Learn about owls and the little critters they eat by doing an owl pellet dissection!

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