Method for producing a pipe assembly

A method for producing a pipe assembly which has a base body with at least one channel, wherein at least one functional element is allocated to the channel, comprising the steps of:

• arranging the functional element on a tool carrier;
• inserting the tool carrier between blow molding tools of a blow mold;
• introducing a tubular preform into the blow mold such that the tubular preform is placed over the tool carrier with the functional element;
• and
• closing the blow mold and producing the pipe assembly from the preform by blow molding, wherein the at least one functional element is connected to the pipe assembly in a materially bonded and/or form-fitting manner;
• wherein the tool carrier is equipped with at least one cutting edge, wherein the blow molding tools bear against the at least one cutting edge when the blow mold is closed and press off the preform so that a separation region is formed.