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Specifications Pack:1 Joint:24/40 Length:300mm Material: borosilicate glass Characteristics Borosilicate glass is resistant to high temperature, acid and alkali, high physical strength, and no toxic side effects Thickened bottle wall, evenly heated, strong and durable, no bubbles and no lines Allihn tube, cooling area is larger than liebig tube Internal grinding mouth design, manual grinding, good sealing Reflux for organic preparation, suitable for liquids of various boiling points, small amount of distillation remains