A capping plant for capping containers made of thermoplastic material, comprising: a capping unit comprising a plurality of capping stations for applying closures to the containers; a transfer star-wheel situated downstream of said capping unit to receive the capped containers, i.e. to which the closures have been applied; an output belt situated downstream of said transfer star-wheel, said transfer star-wheel comprising: a rotating carousel having a plurality of support stations for the containers, each support station comprising a gripping member for gripping one of the containers by the neck thereof at an outer circumference of the rotating carousel; movement means operationally active on each gripping member to move the gripping member along a sliding direction substantially orthogonal to the rotating carousel between a lower limit position and an upper limit position so that the bottom of the container is brougth at the output belt, said movement means comprising a cam so shaped as to define for each revolution of the rotating carousel a movement of the gripping member along the sliding direction between the lower limit position and the upper limit position, said movement means being movable along a direction that is substantially parallel to the sliding direction so as to be able to vary said lower and/or upper limit position. a capping unit comprising a plurality of capping stations for applying closures to the containers; a transfer star-wheel situated downstream of said capping unit to receive the capped containers, i.e. to which the closures have been applied; an output belt situated downstream of said transfer star-wheel, said transfer star-wheel comprising: a rotating carousel having a plurality of support stations for the containers, each support station comprising a gripping member for gripping one of the containers by the neck thereof at an outer circumference of the rotating carousel; movement means operationally active on each gripping member to move the gripping member along a sliding direction substantially orthogonal to the rotating carousel between a lower limit position and an upper limit position so that the bottom of the container is brougth at the output belt, said movement means comprising a cam so shaped as to define for each revolution of the rotating carousel a movement of the gripping member along the sliding direction between the lower limit position and the upper limit position, said movement means being movable along a direction that is substantially parallel to the sliding direction so as to be able to vary said lower and/or upper limit position. a rotating carousel having a plurality of support stations for the containers, each support station comprising a gripping member for gripping one of the containers by the neck thereof at an outer circumference of the rotating carousel; movement means operationally active on each gripping member to move the gripping member along a sliding direction substantially orthogonal to the rotating carousel between a lower limit position and an upper limit position so that the bottom of the container is brougth at the output belt, said movement means comprising a cam so shaped as to define for each revolution of the rotating carousel a movement of the gripping member along the sliding direction between the lower limit position and the upper limit position, said movement means being movable along a direction that is substantially parallel to the sliding direction so as to be able to vary said lower and/or upper limit position.