HIGH PRESSURE VESSEL

A high-pressure vessel includes a cylinder (10) adopted as a central part and composed of a plastic (11), and at least one half-shell (13) composed of a plastic (11), wherein the at least one half-shell (13) is arranged at one axial end of the cylinder (10), and includes a substantially rotationally symmetrical insert (1) as a boss member, the insert (1) has a foot member (14) at the end thereof facing an interior of the high-pressure vessel, the foot member (14) of the insert (1) is embedded in the plastic (11) of the half-shell (13) to substantially form a hollow cone or hollow cylinder. A sleeve (20) is arranged within an inner circumference of the foot member (14) such that the plastic (11) of the half-shell (13) is arranged between the sleeve (20) and the inner circumference of the foot member (14). The high-pressure vessel comprises a valve (21) arranged in the boss member, and includes a stem portion arranged in the sleeve (20). A seal member (22) seals the space between the stem portion of the valve a