Device (D; D') for coupling a pipe located behind a partition to a plumbing fixture or domestic appliance located in front of the partition, said device comprising: - a coupling (4a, 4b; 4) comprising a rear part for coupling to a free end of the pipe and a front part for coupling to the plumbing fixture or domestic appliance, and - a plate for securing the coupling, which plate is designed for being secured against a front wall of the partition and delimits an opening for the pipe to pass through, said opening defining a central axis (X2a, X2b; X2), characterised in that - the device comprises a set (6a, 6b; 6) of wedges (60, 61, 62), - the device comprises an expansion ring (8a, 8b; 8), a central axis (X8a, X8b; X8) of which is parallel to the central axis (X2a, X2b; X2) of the opening, said ring being axially movable and suitable for pushing, by means of the movement thereof, each wedge (60, 61, 62) of the wedge set in a direction that is radial and centrifugal with respect to the central axis (X8a, X8b; X8) of the ring, such that the wedges may be pressed against a bore of a hole arranged in the partition, and such that the device may be locked in the hole by adhesion, - the wedges (60, 61, 62) of the wedge set (6a, 6b; 6) are integral with one another and together form a wedge ring (6a, 6b; 6) arranged coaxially around the expansion ring, - the wedge ring (6a, 6b; 6) comprises an inner surface which converges towards the plate with respect to the central axis and is complementary to an outer surface of the expansion ring (8a, 8b; 8), and - the expansion ring comprises perforations for receiving self-tapping screws, an axial movement of the expansion ring towards the plate being brought about by tightening the screws. - a coupling (4a, 4b; 4) comprising a rear part for coupling to a free end of the pipe and a front part for coupling to the plumbing fixture or domestic appliance, and - a plate for securing the coupling, which plate is designed for being secured against a front wall of the partition and delimits an opening for the pipe to pass through, said opening defining a central axis (X2a, X2b; X2), - the device comprises a set (6a, 6b; 6) of wedges (60, 61, 62), - the device comprises an expansion ring (8a, 8b; 8), a central axis (X8a, X8b; X8) of which is parallel to the central axis (X2a, X2b; X2) of the opening, said ring being axially movable and suitable for pushing, by means of the movement thereof, each wedge (60, 61, 62) of the wedge set in a direction that is radial and centrifugal with respect to the central axis (X8a, X8b; X8) of the ring, such that the wedges may be pressed against a bore of a hole arranged in the partition, and such that the device may be locked in the hole by adhesion, - the wedges (60, 61, 62) of the wedge set (6a, 6b; 6) are integral with one another and together form a wedge ring (6a, 6b; 6) arranged coaxially around the expansion ring, - the wedge ring (6a, 6b; 6) comprises an inner surface which converges towards the plate with respect to the central axis and is complementary to an outer surface of the expansion ring (8a, 8b; 8), and - the expansion ring comprises perforations for receiving self-tapping screws, an axial movement of the expansion ring towards the plate being brought about by tightening the screws.