Abstract: The invention refers to an apparatus which allows the application of a round gasket or liner inside closures. The apparatus consists of a plastic material batching carousel carrying, on a horizontal plate a plurality of shuttles or molds peripherically distributed and whose top surface is provided with a recess or hollow. On the carousel are elements which take and leave batches of plastic material supplied by an extruder inside the recesses. A first star wheel at the bottom of the carousel is provided to transfer the shuttles having the batches therein towards a forming carousel where the batches of plastic material are pressed to form round gaskets. A second star is provided to transfer the shuttles with the molded gaskets toward a further carousel where gaskets are inserted into cups or closures.