Refill system of a liquid container to be refilled, preferably a flacon, comprising a conduit element capable of communicating the inside with the outside of the liquid container and being liquid-tightly connected to the liquid container, and a closing element (31, 310) capable of being in a first position which prevents a liquid flow through the conduit element and a second position which allows a liquid flow through the conduit element, wherein the conduit element is fixedly connected to the liquid container to be refilled and has an upper part with an upper part inner flow passage having one end inside the liquid container and the other end leading past the liquid-tight connection of the conduit element with the liquid container and subsequently through at least one upper part radial opening into a space surrounding the conduit element and defined by the conduit element and a wall of the liquid container, in its first position, the closing element (31, 310) having a first sealing portion is capable of sealing the space defined by the conduit element and the wall of the liquid container liquid-tightly towards the outside, characterized in that the conduit element has a lower part with a lower part inner flow passage that is symmetrical to the upper part inner flow passage and connected through at least one lower part radial opening to the space defined by the conduit element and the wall of the liquid container, wherein, when the closing element (31, 310) is in its second position it seals the space defined by the conduit element and the wall of the liquid container liquid-tightly towards the outside, and the conduit element is capable of receiving a stem of a liquid donor tank by abutment to its lower part. a conduit element capable of communicating the inside with the outside of the liquid container and being liquid-tightly connected to the liquid container, and a closing element (31, 310) capable of being in a first position which prevents a liquid flow through the conduit element and a second position which allows a liquid flow through the conduit element, wherein the conduit element is fixedly connected to the liquid container to be refilled and has an upper part with an upper part inner flow passage having one end inside the liquid container and the other end leading past the liquid-tight connection of the conduit element with the liquid container and subsequently through at least one upper part radial opening into a space surrounding the conduit element and defined by the conduit element and a wall of the liquid container, in its first position, the closing element (31, 310) having a first sealing portion is capable of sealing the space defined by the conduit element and the wall of the liquid container liquid-tightly towards the outside, characterized in that the conduit element has a lower part with a lower part inner flow passage that is symmetrical to the upper part inner flow passage and connected through at least one lower part radial opening to the space defined by the conduit element and the wall of the liquid container, wherein, when the closing element (31, 310) is in its second position it seals the space defined by the conduit element and the wall of the liquid container liquid-tightly towards the outside, and the conduit element is capable of receiving a stem of a liquid donor tank by abutment to its lower part.