A catheter coupling (1) has a tube piece (4) and two cheeks (6) running in the longitudinal direction of the tube piece (4), which cheeks when placed against the tube piece (4) form a channel with an opening to accommodate an end section of a catheter. The cheeks (6) are joined together at one end of each check by means of a cheek hinge having a hinge axis transverse to the tube piece (4). A latch locking element and a latch locking counter-element working together with this to form a latch locking device are present on the other end of each cheek. In the latched position, the tube piece (4) is deformed by at least one cheek deformation component to securely accommodate the catheter end section. The catheter coupling (1) has at least one inspection window (22a) in a main body. A visual inspection of a stop in the tube piece (4) for the end section of the catheter can be performed through the inspection window (22a). The outcome is a catheter coupling which prevents an end section of the catheter that is too short being erroneously inserted into the tube piece.
