Abstract: An engine exhaust conduit sealed joint having controlled axial expansion between two telescopically interfitted ducts with a slide seal therebetween, and the ducts held by first and second clamp connectors, one of the ducts having an annular shoulder and one of the clamp connectors being hat-shaped to extend axially on both sides of this shoulder with an annular stop surface to engage the annular shoulder. The seal has an arcuate cross section in engagement with the outer periphery of the one duct, and having a pair of opposite, annular, diagonal surfaces, one of which is engaged by the one clamp connector and the other of which is engaged by a flared end of the other duct which in turn is engaged by the other clamp connector.