Device for connecting a tubular element

A coupling device of a tubular element, comprising:

• a substantially cylindrical hollow body having a housing that leads into an opening, the housing having a first notch;
• a cartridge locked in the housing in a first position, the cartridge projecting from the opening of the hollow body in the first position, the cartridge having an outer wall and an inner wall that defines an inner channel, the inner channel having a first end that forms an inlet for receiving the tubular element and a second end that is provided with an obstacle, the cartridge further comprising a first retaining member supported on its outer wall and designed to fit elastically into the first notch in order to hold the cartridge (4) in the first position;
• an annular seal arranged in the inner channel;
• a fastening ring arranged in the inner channel, between the inlet and the annular seal, to sealingly fix the tubular element in the inner channel, wherein the fastening ring is C-shaped;
• and
• an unlocking system designed to allow the cartridge to be unlocked and moved from the first position to a second position, in which the cartridge is fully integrated in the hollow body when the tubular element, inserted in the inner channel, exerts a force against the obstacle.