Trüpower Dodge Cummins 2003-2007 5.9L Injector Supply Connector Tubes (aka fuel feed tubes, inlet connectors, inlet tubes) transport highly pressurized diesel fuel from the common rail/pump to the injector inlet. They are positioned through the side of the cylinder head forming a tight metal to metal seal between the tube and the injector body. Precision torque levels are required to avoid fuel leaks, injector misses or low engine power. We highly recommend replacing inlet connector tubes whenever injectors are being replaced to avoid fuel leaks and/or contamination. Our stainless steel construction ensures corrosion protection and durability to increase the life of the injector inlet connector tubes.