Connecting device and part group that has this connecting device

The utility model relates to a connecting device and a part group that has this connecting device, connecting device is used for being connected medical hose with medical fluid conveyor, and connecting device includes: the plug -in element of connection on the hose, plug -in element have and have the first first fluid passageway that lets in mouthful, and arrange the part that is coupled on fluidconveyor, be coupled the part have along vertical axis extend have second fluid passageway that the second let in mouthful and plug -in element with be coupled the part can coupled linking, it has tubular external component to be coupled the part, external component has the leading edge and arranges coaxially at tubular insert wherein, the insert contains the second fluid passageway, wherein the preceding tip of insert has defined that the second lets in mouthful and return external component's inside backward in the orientation of directaxis about external component's leading edge. The firstinside that begins to retu