Abstract: Saddle tap assemblies comprising internal collars and external saddle taps are disclosed. A saddle tap assembly may include an external slip tap, internal tap collar, a duct section, and adhesive. The external slip tap and the internal tap collar may each have a flange. The flanges may be curved. The flange of the internal collar may have a sheared portion permitting the flange of the internal collar to pass through an opening in a section of duct. The installation of saddle tap assemblies according to embodiments of the present invention is more cost-effective and less time consuming than conventional methods. Moreover, the seals and bonds formed using embodiments of the present invention provide for several layers of chemical protection and structural stiffening wherever the saddle tap assemblies are located.