Abstract: The invention relates to a system of distribution of a fluid under pressure for a driving device. The system comprises a main distributor D.sub.3 mounted on a base plate E.sub.3, and at least one auxiliary unit such as a progressive starter U.sub.1 or a drain-blocker U.sub.2, wherein the auxiliary unit U.sub.1, U.sub.2 comprises a standard distributor D.sub.1, D.sub.2, advantageously of the same type as the main distributor D.sub.3, which is mounted interchangeably on a specific base plate E.sub.1, E.sub.2 configured to determine the function of the auxiliary unit and associable with the base plate E.sub.3 of the main distributor D.sub.3 and with the base plates of other auxiliary units if any.