Abstract: A method for manufacturing a pressure vessel for a motor vehicle comprises the steps: providing a hollow basic body as a primary stage of the pressure vessel, wherein the basic body has an initial internal volume, and wherein the basic body has a wall, which extends fully around a longitudinal axis of the basic body, wherein the wall has an opening, which has an opening rim; providing a hollow auxiliary body, which has a base wall and a peripheral wall, wherein the peripheral wall is open on a side lying opposite the base wall; joining the auxiliary body with the basic body at the opening in the wall of the basic body, such that the pressure vessel having a desired final internal volume which is larger or smaller than the initial internal volume of the basic body is obtained. In addition, such a pressure vessel in the form of an air suspension pot of a suspension is described.