6 Pieces Fuel Injector 3018321 3054226 for Cummins Engine N855 NH855 NT855 Condition: New Aftermarket Part Note: We recommend replacing the entire set of fuel injectors to ensure the engine's optimal performance. Due to differences in oil output and atomization concentration between and aftermarket parts, they should not be mixed. Replacing the entire set of injectors helps avoid potential issues.Replacement Part Number: 3018321, 3054226, 3018321PX, 3054226-PX, 3018321-XX, 3018321XXF it for Cummins Engine: N855, NH855, NT855