NTA855 Cummins Injector 3047991 Parts Catalog Ref No. Part Name Part No. Required 　 Injector 3047991 6 1 Compression Spring 166009 6 2 Check Ball 167157 6 3 Injector Gasket 173086 6 4 Screen Retainer 174299 6 5 Injector Cup Retainer 185138 6 6 O-Ring Seal 193736 18 7 Roll Pin 203426 12 8 Filter Screen 3008706 6 9 Injector …