English to Italian Tech/Engineering Mechanics / Mech Engineering

Co-testo:
When no main oil pump with its own driver is provided for lubrication of the crankgear, the main oil pump is housed on the shield mounted on the side opposite the compressor driver, and is driven by the compressor shaft (see LUBRICATION Section).
The oil is distributed to the various points to lubricate both through a **header** and through a duct inside the shaft.
In some cases distribution is integrated by an appropriate **header**.
The oil collects in the bottom of the crankcase, which thus serves also as oil sump.

Si parla della distribuzione della lubrificazione, credo ai componenti di un compressore. Pensavo di tradurre il primo "header" con collettore, ma poi me ne trovo un altro subito dopo. Qualche consiglio su entrambi?