An assembly device comprising: - a first sleeve intended to equip a first tube, and a second sleeve intended to equip a second tube, said first and second sleeves (1, 10) being configured to cooperate by interlocking along a longitudinal axis (z), - a flange mounted on one of the first and second sleeves (1, 10), and configured to • retain the other of the first and second sleeves in translation along the longitudinal axis (z), in an assembly position, • release the other of the first and second sleeves (1, 10) in a disassembly position, said disassembly position being obtained by exerting a force on a periphery of the flange, - elastic means bearing against the first sleeve and configured to exert a return force along the longitudinal axis, - a cable which is slidably mounted relative to the first sleeve and having a first end retained by said elastic means, said cable having a second end intended to be retained by retaining means of the second sleeve, the device being characterised in that the second end of the cable and the retaining means have complementary shapes such that: - in a mounting position, the second end of the cable is engaged in the retaining means and engaged with the retaining means, the retaining means forming a stop for the second end along the longitudinal axis (z) allowing the elastic means to exert said return force, such that the first and second sleeves (1, 10) are linked to each other by the cable, - in a dismounting position, the second end of the cable is disengaged from the retaining means and free relative to the retaining means, such that the first and second sleeves (1, 10) are no longer linked to each other by the cable, and in that the engagement and disengagement in the respective mounting and dismounting positions are done manually. - a first sleeve intended to equip a first tube, and a second sleeve intended to equip a second tube, said first and second sleeves (1, 10) being configured to cooperate by interlocking along a longitudinal axis (z), - a flange mounted on one of the first and second sleeves (1, 10), and configured to • retain the other of the first and second sleeves in translation along the longitudinal axis (z), in an assembly position, • release the other of the first and second sleeves (1, 10) in a disassembly position, said disassembly position being obtained by exerting a force on a periphery of the flange, • retain the other of the first and second sleeves in translation along the longitudinal axis (z), in an assembly position, • release the other of the first and second sleeves (1, 10) in a disassembly position, said disassembly position being obtained by exerting a force on a periphery of the flange, - elastic means bearing against the first sleeve and configured to exert a return force along the longitudinal axis, - a cable which is slidably mounted relative to the first sleeve and having a first end retained by said elastic means, said cable having a second end intended to be retained by retaining means of the second sleeve, - in a mounting position, the second end of the cable is engaged in the retaining means and engaged with the retaining means, the retaining means forming a stop for the second end along the longitudinal axis (z) allowing the elastic means to exert said return force, such that the first and second sleeves (1, 10) are linked to each other by the cable, - in a dismounting position, the second end of the cable is disengaged from the retaining means and free relative to the retaining means, such that the first and second sleeves (1, 10) are no longer linked to each other by the cable,