An installation for transporting containers having necks, the installation comprising an intermediate rotary platform provided in its periphery with slots each having a jaw mounted in the vicinity thereof in order to pivot between a closed position and an open position. Each jaw is provided with blocking means for blocking it in each of its positions, and includes a first contact surface projecting into the slot when the jaw is in the open position in such a manner that when the neck is inserted into the slot it pushes against the first contact surface and brings the jaw into the closed position, and a second contact surface facing the slot when the jaw is in the closed position in such a manner that when the neck is discharged from the slot it pushes against the second contact surface and brings the jaw into the open position.