The invention relates to a pipe distribution system, comprising at least one central main pipe (20) and at least one functional unit for conducting and distributing a fluid flow in a heating-circuit system or cooling-circuit system, wherein the functional unit is designed, for example, as a flow regulator, wherein at least one component of the functional unit consists both of a plastic and of a metal, wherein the metal and the plastic are fixedly joined to each other in such a way that the metal and the plastic cannot be nondestructively separated from each other.
