Abstract: Sealing ring of an elastic material, for use in a pipe coupling in which the ring is placed in a radially inwardly open peripheral groove and is retained in said groove by means of a supporting ring(6) which sealing ring in each radial cross-section is the shape of an inwardly open, essentially rectangular trough with a circular bottom (2), a projecting lip (8) being provided which runs inwards at an angle from the end of the first circumferential wall of the trough, the free end of which lip lies at a radial distance from the axis of symmetry of the ring which is smaller than the external radius of the push-in end part of a pipe to be coupled and at the end of the second side wall of the trough, the free end of which lip lies at a greater distance from the above-mentioned axis than the free end of the first lip, the second lip being provided with a run-on face (10) which runs from a point near the bottom of the lip in the direction of that axis to an end point which lies at a distance from the axis which is