An Injection Assembly typically for use with High Pressure Access Systems consists of an Access Fitting body with a side Tee through which the fluid transfer takes place. The Tee may be threaded or welded. Welded Tees are either flanged or buttweld nipples. Threaded Tees depend on an NPT tapped hole on the fitting body. The Tee size is rated depending on the injection rate and the injected chemical's viscosity.