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Tapón grifo, caracterizado por que está constituido por un corcho, destinado a encabarse en la boca del cuello del recipiente, que aloja un tubo, dividido por una pared longitudinal en dos partes: una mayor, destinada a la salida del líquido, y la otra para la entrada del aire, que se prolonga algo por debajo del borde del corcho; formando el tubo en su otro extremo una especie de martillete, que a un lado presenta el codo de salida del líquido y al otro el orificio para la entrada del aire.