522-043 - Diesel Fuel Injector Inlet Tube (Stock Replacement)This premium fuel inlet tube for the Cummins 5. 9L and 6. 7L engine is a critical component in the fuel supply system. It should be replaced any time the injector is serviced or replaced to reduce potential injector failure from contamination. The upgraded design of this part includes several features including a larger sealing surface to improve sealing between the fuel injector and inlet tube, an integrated edge filter and improved alignment pin.