Vessel neck construction of a pressure vessel

Pressure vessel for the storage of liquid or gaseous media, comprising:

• a plastic inner vessel with at least one neck piece which is not provided as a single piece with the plastic inner vessel and which is arranged on a vessel neck in a region of a vessel orifice, and with a supporting jacket at least partially surrounding the plastic inner vessel and the neck piece, the neck piece provided with means to receive a connection fitting, and at least one insert which forms at least part of the vessel neck and which forms a sealing seat for the connection fitting to be received into the neck piece, wherein the insert comprises a sleeve-shaped cylindrical part, characterized in that the sleeve-shaped cylindrical part of the insert forms, with a wall of the plastic inner vessel, a vessel neck drawn into an interior of the plastic inner vessel, wherein the wall of the plastic inner vessel is drawn in conically in the region of the vessel orifice to provide a conical portion, and forms a connection piece reverse-drawn into the interior of the plastic inner vessel;
• and
• wherein the neck piece is seated in the conical portion of the plastic inner vessel;
• and
• wherein the sleeve-shaped cylindrical part of the insert provides the sealing seat for the connection fitting and projects into the interior of the plastic inner vessel such that, when the pressure vessel is pressurized, an internal pressure of the vessel acts radially upon the sleeve-shaped cylindrical part to reinforce a seal formed between the sleeve-shaped cylindrical part and the connection fitting.