It seals the connection between the turbocharger and the exhaust manifold/flange.
Compatible engines: Cummins L10, M11, ISM, and QSM.
Cummins also notes that this product is primarily intended for use with certain uncertified 14-liter N14 engines; exact compatibility should be verified with ESN/CPL.
Cylinder head; can be used as a seat for the intake or exhaust valve, depending on the cylinder head configuration.
Compatible engines: Cummins L10 / LTA10. Some aftermarket catalogs also list the M11, but Cummins officially specifies part number 3418040 primarily for non-certified 10-liter L10 engines. Always verify using the Engine Serial Number (ESN).