








category
Stoppers and Corks
This core borer is used to make uniform, large 15 mm (9/16") diameter holes in rubber stoppers or corks.
Ages 11+
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This set of six cork borers allows you to make uniform holes in rubber stoppers and corks to meet a variety of laboratory needs.
Ages 11+
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Diameter of 26-32 mm. Fits Pyrex 250 ml flasks.
Ages 5+
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Diameter of 18-24 mm. Fits plastic soda bottles.
Ages 5+
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These No. 14 lab-grade corks fit Pyrex 250 ml flasks and most 500 ml flasks.
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These No. 2 lab-grade corks fit our small 13 mm x 100 mm test tubes.
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Diameter of 12-13 mm. Fits small test tubes.
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These No. 4 lab-grade corks fit our large 16 mm x 150 mm test tubes.
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These No. 6 lab-grade corks fit our extra-large 20 mm x 150 mm test tubes.
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These large No. 9 lab-grade corks fit 1-2 liter plastic soda bottles.
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Get the rubber stoppers you need most with this one-pound assortment.
Ages 8+
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You will always have the right size rubber stopper on hand with this 2 lb package of assorted solid, 1-hole and 2-hole stoppers ranging in size from #00 to #8. You get 60 stoppers total.
Ages 8+
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These #0 rubber stoppers are 13-17 mm diameter with one 3 mm diameter hole.
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These #0 rubber stoppers are 13-17 mm diameter with two 3 mm diameter holes.
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These #0 rubber stoppers are 13-17 mm diameter. #0 rubber stoppers fit large test tubes.
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These #00 rubber stoppers are 10-15 mm diameter with one 3mm diameter hole.
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These #00 rubber stoppers are 10-15 mm diameter.
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These #1 rubber stoppers are 14-19 mm diameter with one 5mm diameter hole.
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These #1 rubber stoppers are 14-19 mm diameter.
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These #10 rubber stoppers are 42-50 mm diameter with one 5 mm diameter hole.
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42-50 mm diameter. Fits many vacuum bottles.
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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.
Ages 8+
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These No. 2 rubber stoppers are 16-20 mm diameter with one 5 mm diameter hole.
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These No. 2 rubber stoppers are 16-20 mm diameter with two 3 mm diameter holes.
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These solid No. 2 rubber stoppers are 16-20 mm diameter.
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These #3 rubber stoppers are 18-24 mm diameter with one 4 mm diameter hole.
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These #3 rubber stoppers are 18-24 mm diameter with two 4 mm diameter holes.
Ages 8+
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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 #4 rubber stoppers are 20-26 mm diameter with one 5 mm diameter hole.
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These #4 rubber stoppers are 20-26 mm in diameter with two 5 mm diameter holes.
Ages 8+
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These #4 rubber stoppers are solid and 20-26 mm in diameter.
Ages 8+
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These #5 rubber stoppers are 23-27 mm diameter with one 5mm diameter hole. No. 5 rubber stoppers fit Pyrex 125 ml Erlenmeyer flasks.
Ages 8+
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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.
Ages 8+
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Use rubber stoppers and lab-grade corks to contain liquids in test tubes and flasks
Keep your chemistry experiments clean and safe with rubber stoppers! These sturdy plugs fit tightly into test tubes or flasks to prevent chemical leaks and spills.
Some lab work requires a full setup of glassware. You’ll need one- or two-hole rubber stoppers for those experiments, and use 5 mm glass tubing to connect to other apparatus.
For small test tubes use #00 stoppers. Use #0 for large test tubes, and #1 for extra large. Use #6.5 stoppers for 250 ml flasks. Use a cork borer to drill holes in the corks.
And use our quick & easy guide to identify which size of rubber stopper you need.
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