It is located between the cylinder head and the exhaust manifold; it prevents exhaust gases from escaping.
Cummins specifies the primary use for 10-liter L10 engines; aftermarket catalogs extend the application to the M11, ISM, and QSM families. Final compatibility should be verified using the engine’s serial number.
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.