Patent ID: 7506897

Claim:
A plug-in coupling for connecting a fluid conduit to a pipe, the plug-in coupling comprising: a pipe section having a first end section configured to be connected to a fluid-conduit and having a second end section configured to receive and lock a pipe; a closed securing ring attached to the pipe section; at least one sealing ring inserted into the pipe section and configured to seal the pipe relative to the pipe section, wherein the at least one sealing ring is positionally secured in the pipe section directly between the securing ring and an inner shoulder of the pipe section wherein the pipe section has a slot extending in a circumferential direction of the pipe section and a support surface located diametrically opposite the slot; wherein the securing ring is inserted radially with respect to the pipe section into the slot until the securing ring contacts the support surface and wherein a circumferential section of the securing ring is received in the slot; and wherein the securing ring on a side remote from the slot has a projection and wherein the pipe section has an at least partially continuous recess, wherein the projection engages the recess.