Patent ID: 7597362

Claim:
A plug-in connection for tube and hose lines comprising a nozzle having an inserting end and a radially outward projecting inclined shoulder extending at least partially around the outer circumference of the nozzle, the shoulder forming a latching surface on a side facing away from the insertion end, and a plug receiving the nozzle, the plug including an approximately U-shaped catch spring having an approximately centered section and two lateral legs adapted to latch on the latching surface of the nozzle shoulder when the nozzle is inserted in the plug, wherein the approximately centered section of the catch spring is located rearward in relation to the two lateral legs when viewed toward the nozzle, causing the approximately centered section of the catch spring to move across the inclined shoulder when the nozzle is inserted in the plug, and to urge the legs of the catch spring radially outwardly, and wherein the catch spring is movable into a lowered position to cause the legs of the catch spring to latch synchronously and concurrently in the region of the latching surface on the shoulder.