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U-Shaped Drying Tubes with Side Arms - American Scientific
Amazon.com: DADAKEWIN 13 * 100mm Drying Tube U-Shaped Glass Tube for Air Drying, Borosilicate 3.3 Glass Heavy Duty Customizable Lab Tubes- Pack of 1 (Color : 13 * 100mm) : Industrial & Scientific
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Eisco Manometer, Glass
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Amazon.com : Seachem Laboratories Glass U Tube, 10mm : Pet Supplies