Compact and demountable fluid connection device

A connection device for connecting a tubular connector to an item of equipment comprising a passage therein, the tubular connector defining a longitudinal direction and including an annular collar, the connection device comprising:

• a connection end fitting configured to connect to the passage of the item of equipment, the connection end fitting having a tubular body and a head having an opening leading into the tubular body and comprising an elliptical annular groove defining an ellipse having a major axis and a minor axis;
• and
• a locking ring including two flexible longitudinal legs configured to be inserted into the connection end fitting, each of the two flexible longitudinal legs having an elliptical-shaped cross section, an inner surface, an outer surface, and a free end, the outer surface carrying at least one lug configured to clip into the annular groove to keep the locking ring integral with the connection end fitting, the two flexible longitudinal legs capable of deforming and closing on the tubular connector when the tubular connector is introduced longitudinally into the locking ring while the two flexible legs are arranged opposite each other on the minor axis of the ellipse.