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These Corning PYREX® filtering flasks, without tubulation, are blown in special molds in shapes designed to give maximum mechanical strength. The filtering flasks are marked "Filter Flask" to avoid confusion with similar sizes of Erlenmeyer flasks. Filtering flasks are graduated to show their approximate capacity with permanent white enamel graduations. Large marking spots for easy sample identification. Beaded rim accepts a standard size rubber stopper according to neck size.