6BT5.9 Cummins Injector 4991280 Parts Catalog Ref No. Part Name Part No. Required 1 Rectangular Ring Seal 3909356 4 2 Injector 4991280 4 Above is the introduction of the 4991280 Cummins Injector, while if you need Injector 4991280, complete Cummins engine or other Cummins product, please further consult our sales.