A-3924582 Insert; Intake ValveOne New Aftermarket Replacement Intake Valve Seat Insert for Cummins C Series Diesel Engines This intake valve seat insert (also called a valve insert) is a precision cylinder head component for Cummins C Series diesel engines. Pressed into the cylinder head, the valve seat insert provides the hardened seating surface against which the intake valve seals on every combustion cycle, maintaining compression and proper airflow into the engine. Compatible