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The neck of these borosilicate glass cylindrical flasks accepts a Standard Taper 45/50 pennyhead stopper (LG-10300-120)*. Flasks are offered in volumes ranging from 4000 to 20,000mL. * NOTE: Stopper sold separately. Scientists rely on the expertise and artistic skills of Wilmad-LabGlass' engineers and glass specialists to manufacture NMR and EPR consumables and laboratory glassware of the highest quality. Used daily in academia, healthcare and chemical, petroleum and other industrial applications, Wilmad offers 7000+ items as part of their standard catalog as well as custom fabrication for individual glassware, glass repair services and OEM glass parts.