Abstract: In order to improve the operating capabilities of a plug-in coupling for hoses comprising a sleeve, into which a hose stem can be sealingly inserted, a U-shaped, elastically deformable locking element which is held on the sleeve for displacement at right angles to its longitudinal axis and engages with its two arms behind a projection on the hose stem and hereby prevents its withdrawal, and wedge surfaces arranged on the sleeve, on which the two arms of the locking element abut and which spread these arms elastically apart during displacement of the locking element to such an extent that the hose stem is released, it is suggested that the locking element be formed by a U-shaped housing which has an upper wall and two side walls and surrounds the sleeve essentially over its entire length, that the arms be projections formed on the side walls and that the upper wall of the housing be designed as a pressure surface.