The below engine parts Cummins o ring are for the 4BT3.9/6BT5.9/6CT8.3/6LT8.9/ISDe/ISLe/ISZ/M11/NT855/ KT19/KT38/KT50/ISF2.8/ISF3.8/ISM11/QSM11 series Cummins engine. Part Name Part No. Part Name Part No. Seal,O Ring 3090126F DCEC O-ring 2830409 Seal,O Ring 5261587F DCEC O-ring 3066211 Seal,O Ring 3922794F DCEC O-ring 3075658 Seal,O Ring 4062328F DCEC O-ring 3090126 Seal,O Ring 2830977F …