You are purchasing an install kit for injectors on a 6.9 or 7.3L, from 1991 -1994. It will not work on the Powerstroke engines. This come with copper seals, return caps, orings, clamps and return hose to do a complete engine. The is the later style return tee’s that have the larger return line. If your truck is an earlier model that 1991, this is not the kit that you need.