These borosilicate glass three-way adapters have two parallel, upper outer Standard Taper joints and one lower inner Standard Taper joint - all of the same size. Claisen adapters allow an additional entry into single or multiple neck flasks and are useful for reflux with addition reactions. 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.