Connecting device for coupling a tubular member to a threaded tubular port, in particular for washing machines

A connecting device for coupling a tubular member having on one end an outer shoulder or flange to a threaded tubular port,

• the connecting device comprising:
• a nut with a first threaded end portion adapted to be screw-coupled with said port and a second end portion adapted to receive said end of the tubular member, and
• a coupling ring adapted to be interposed between the tubular member and said second end portion of the nut for connecting them to one another;
• the coupling ring being resiliently deformable in a radial direction and being adapted to be mounted around the tubular member, in proximity of the end shoulder or flange thereof, such as to be prevented by said end shoulder or flange from being taken away from the tubular member, but to be allowed to freely rotate around said tubular member;
• said second end portion of the nut and the coupling ring being threaded such as to allow the nut to be screw-fastened to the coupling ring after the latter has been mounted on the tubular member, before the nut is screw-fastened to said tubular port;
• the nut and the coupling ring being provided with respective first and second engagement members adapted to prevent them from being unscrewed one from the other.