Arrangement for connecting a metal pipe to a receiving sleeve

An arrangement for tightly connecting a metal pipe to a receiving sleeve, the receiving sleeve having on an inner side thereof two diametrically oppositely located grooves, the receiving sleeve having an end face, wherein the grooves terminate at the end face of the receiving sleeve, the arrangement comprising a plug-in sleeve of metal fastened on the metal pipe, the plug-in sleeve having radial projections adapted for engagement in the grooves of the receiving sleeve, the receiving sleeve and the plug-in sleeve each having tangential slots, further comprising a U-shaped clamp engaging in the tangential slots of the receiving sleeve and the plug-in sleeve for coupling the receiving sleeve and the plug-in sleeve with one another detachably but rigidly with respect to pulling and pushing forces, the plug-in sleeve comprising a cylindrical fixing portion having inner and outer diameters, a cylindrical coupling portion having greater inner and outer diameters than the fixing portion, and a conically-shaped transition portion having a uniform wall thickness, the transition portion integrally connecting the fixing portion and the coupling portion, the radial projections being substantially axially oriented tongues cut out of the coupling portion and extending at an angle relative to the coupling portion.