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Tapón irrellenable caracterizado por que comprende una pieza cilíndrica enchufable en el interior del cuello de una botella u otro recipiente y provista en su extremo de salida de uno o varios discos o tabiques ligeramente espaciados longitudinalmente y provistos de aberturas no coincidentes, mientras que en su extremo de entrada se encuentra una válvula de charnela que abre hacia fuera cerrando en sentido contrario.