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Several types of plastic test tube caps are available for use in chemistry labs. The most common type is universal caps, which are capable of fitting into three distinct sizes of plastic test tubes. Other types of plastic test tubes caps include hollow top cap, hollow bottom caps, flange caps, two-position caps, etc. Then there are the thumbs caps, which are the traditional tube stopper type caps. Few plastic test tubes cap come with screws to provide total immunity from leakages.