The connection system comprises a line element (3) and a connecting element (2) for liquid-tight connection with a tubular element (1) on one hand and the line element on the other hand. The connecting element and the tubular element axially overlap with the line element. A holding element (3C,3F) is provided with a radial elastically expandable snap ring (3B), which is beaded outside by other portions of the holding elements and is snapped at the element of the connection system in a connection state.
