Patent ID: 7614665

Claim:
A plug-in connection for connecting pipes or hoses, comprising a nozzle having at least one catch shoulder, and a plug adapted to interfit with the nozzle and including an inner sleeve and an outer sleeve, said inner sleeve being spaced apart from and substantially parallel to the outer sleeve, wherein the plug further includes at least one opening extending through the inner and outer sleeves, and a catch spring having legs adapted to protrude inwardly through the at least one opening and latch behind the at least one catch shoulder of the nozzle, wherein the inner sleeve and the outer sleeve are joined at an end of the plug facing the nozzle by a material connection, thereby enabling the inner and outer sleeves to withstand a high static and dynamic pulling force; and wherein the inner sleeve and the outer sleeve form a double wall at least in a region proximate to the at least one opening, said double wall in the proximate region being formed by squeezing together the inner sleeve and the outer sleeve.