Abstract: A coupling includes a metal body having a cavity for receiving the end of a tube. The coupling has an electrically conductive, resilient member which is in electrical contact with the metal body and one part of which is intended to exert a resilient force on the outer surface of the tube so as to establish electrical contact with the tube.

Abstract: The seal (4) has an annular body (10) with a generating section which is substantially rectangular and with an inner cylindrical surface (18) having a diameter (d1) substantially equal to the nominal diameter of the tubing (2) to be connected to the coupling (1). The seal (4) has a rib (20) projecting radially inwardly and having an inner diameter (d2) less than the outer diameter (d1) of the tubing. The seal also has an annular lip (24) which projects axially and has an inner surface with a diameter (d3) intermediate the internal diameter (d2) of the radial rib (20) and the diameter (d1) of the inner surface (18) of the seal (4).