Fuel Injector 3349861 for Cummins Engine K50 KTA50 QSK50 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: 3349861, 3349861 PX, 3349861PXF it For Cummins Engine: K50, KTA50, QSK50