<p>The pipe coupling (1) has a housing (2) with a chamber (3) to accommodate a connector attached to the pipe end and provided with a locking protrusion. A U-shaped retaining spring (7) narrows the mouth the chamber and during insertion of the connector is elastically expandable by action of the locking protrusion. At least one blocking element (12) in the chamber blocks an expanding of the retaining spring in the inserted and locked state of the connector during a tensile loading of the locking connection.</p>
