Patent ID: 7559583

Claim:
A tube coupling for first and second tube elements comprising: a socket having a connecting portion for the first tube element and at least one insertion opening, a plug which can be inserted axially into the socket and having a connecting portion for the second tube element, a joining portion for a torque proof junction comprising at least one axial rib arranged in the socket and/or on the plug and at least one corresponding axial groove arranged on the plug or in the socket, at least one locking element, a securing portion for securing the position of the plug inside the socket, the securing portion having a first annular groove formed in the socket and a corresponding second annular groove formed on the plug, wherein the at least one locking element can be inserted into the two annular grooves via the at least one insertion opening in order to produce a form-locking connection between the socket and the plug, the locking element being designed as a curved, approximately cuboid wedge, a securing bolt, a stop forming part of the locking element and projecting radially outwards, and a plurality of evenly spaced radial bores located in the annular groove of the plug for accommodating the securing bolt in order to secure the position of the locking element.