The XDP 6.0L High Pressure Oil Rail Ball Tubes XD213 connect the fuel injector to the high pressure oil rail in your 2004.5-2007 Ford 6.0L Powerstroke. Over time, the seals commonly leak causing hard start, or no start conditions. Replacing the Ball Valves and Seals saves money and time by eliminating the need to replace the entire oil rail. Includes (8) Ball Tubes and (8) Seals. Installation tool not included.