Dealing with high-pressure oil pump leaks on your Ford 7.3L or Navistar diesel? This master service kit has all the seals and O-rings you need to stop those leaks and restore performance. It fits Ford Powerstroke 7.3L engines (1994–2003) and Navistar DT466 & T444E engines (1995–2004). Replaces part numbers ISK635, ISK617, ISK795, and TL3. Inside you'll find discharge port O-rings, rear port plug O-ring, IPR valve O-ring, IPR nut, fill plug O-ring, non-serviceable port plug, check ball, thread sealer, STC fittings, a disconnect tool, and the pump mounting gasket—everything for a complete reseal. Made from quality rubber and steel to withstand heat and pressure. Perfect for DIYers or shops looking to save time and money. Includes a 2-year warranty and 60-day satisfaction guarantee. Get your diesel running strong again!