A flexible conduit element configured for use in exhaust systems, comprising: a bellows member; an interlock member; an outer fixing member; and an connection nozzle, wherein in an axial cross section at an end portion of the flexible conduit element, the outer fixing member is disposed outside of the bellows member, the bellows member is disposed outside of the interlock member, and the interlock member is disposed outside of the connection nozzle, and a gas-tight seal connects the bellows member and the connection nozzle, an end portion wall thickness of the interlock member is less than a mid portion wall thickness of the interlock member, and an end portion internal diameter of the interlock member is greater than a mid portion internal diameter of the interlock member, characterized in that the gas tight seal comprises either: a welded or brazed joint where a weld bead comprising a filler material extends from an axial end face of the outer fixing member, across the axial end faces of the bellows member and interlock member, to an outer circumferential face of the connection nozzle, or a welded connection that forms a consolidated portion in the interlock member, the welded connection extending from an inner circumferential face of the outer fixing member to an outer circumferential face of the connection nozzle, via the bellows member and the consolidated portion. a bellows member; an interlock member; an outer fixing member; and an connection nozzle, wherein in an axial cross section at an end portion of the flexible conduit element, the outer fixing member is disposed outside of the bellows member, the bellows member is disposed outside of the interlock member, and the interlock member is disposed outside of the connection nozzle, and a gas-tight seal connects the bellows member and the connection nozzle, an end portion wall thickness of the interlock member is less than a mid portion wall thickness of the interlock member, and an end portion internal diameter of the interlock member is greater than a mid portion internal diameter of the interlock member, characterized in that the gas tight seal comprises either: a welded or brazed joint where a weld bead comprising a filler material extends from an axial end face of the outer fixing member, across the axial end faces of the bellows member and interlock member, to an outer circumferential face of the connection nozzle, or a welded connection that forms a consolidated portion in the interlock member, the welded connection extending from an inner circumferential face of the outer fixing member to an outer circumferential face of the connection nozzle, via the bellows member and the consolidated portion. a welded or brazed joint where a weld bead comprising a filler material extends from an axial end face of the outer fixing member, across the axial end faces of the bellows member and interlock member, to an outer circumferential face of the connection nozzle, or a welded connection that forms a consolidated portion in the interlock member, the welded connection extending from an inner circumferential face of the outer fixing member to an outer circumferential face of the connection nozzle, via the bellows member and the consolidated portion.