The top of these borosilicate glass Liebig condensers have a Standard Taper outer joint and the bottom has same size* inner joint, with drip tip. *NOTE: Model ML-560-702 has different sized top and bottom joints. 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.