A intake manifold or splitter for an internal combustion engine and a process for production of same wherein a functional unit, comprised of a shaft with valves attached thereto, is assembled with bearing parts comprising clothespin-like clamps that clamp onto the shaft to form a sub-assembly which is mounted as a unit into receiving housing of the manifold or splitter, wherein a molding or over-molding at is provided at a level of the contact surface of a connection plate to lock the assembly of valves, shaft and bearings into the receiving housings and form sealing formations that seal against gases between the intake manifold or splitter and the internal combustion engine.