ROCKER BOX  GASKET FOR NHC 250 CUMMINS ENGINES FOUND IN M809, M939, AND M939A1 MODELS. 

THIS IS NOT FOR THE VALVE COVER, BUT I DO OFFER THE VALVE COVER GASKETS AS WELL IF YOU NEED THOSE. 

3 GASKETS REQUIRED PER ENGINE.

NOT FOR M939A2 WITH CUMMINS TURBO ENGINE. 

PART # 3017750 NSN 5330-00-861-8592, 5330008618592, 217523, 187589