The invention relates to a pressure vessel for a machine, especially a turbomachine, which comprises at least 3 casing shell sections, wherein the intersection region of the parting joints is sealed off by a plug which in its interior has a system of holes and passages through which a sealing compound is pressed into the region between plug and casing shell sections, so that after its setting, an elastic, leakproof and non-destructively disassemblable sealing of the intersection region of the parting joints is created. The plug can be fastened on the casing shell sections by means of an integrated flange.