These U-shaped borosilicate glass drying tubes have a Standard Taper joint at one end and are designed to avoid desiccant contact with reaction. Other end is open to receive size a #2 rubber stopper with bent inlet tube (included). 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.