Rubber Stopper, #4, 2-hole

These #3 rubber stoppers are 18-24 mm diameter with two 4 mm diameter holes.

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

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The perfect lab thermometer for science experiments! It has a range from -20 to 110 degrees Celsius and 0 to 230 degrees Fahrenheit.

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5mm glass tube fit in all rubber stoppers & attach to 4.8 mm plastic or rubber tubing. Pack of two.

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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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This 15 g bottle of benzoic acid is in crystal form. Can be used as a preservative or pH adjuster. Dissolve this crystalline chemical in water to make a liquid solution. Find benzoic acid's density, formula & more below!

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This 30 g bottle of zinc metal mossy is in a lumpy form. Provides greater surface area for a number of chemistry experiments! Take a look at the table below to discover the zinc mossy formula, grade, density & more.

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Everything you need for test tube experiments! This set contains 6 glass test tubes, a rack, cleaning brush, stoppers, and clamp.

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Get high-quality chemistry hardware & lab supplies! This 12-piece chemistry starter kit includes a support ring, a test tube rack, beaker tongs, a pinchcock clamp, a clay pipe-stem triangle, a burner tripod stand & more!

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Porcelain evaporating dish with 100 ml volume capacity and 90 mm diameter for heating chemical solutions.

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