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. <EOS>