A device for treating fabrics in a tumble dryer comprising: a reservoir (6) for storing a fabric treatment composition and transfer means (300) to expose fabric treatment composition from the reservoir to airflow generated inside the tumble dryer and/or to directly contact fabrics in the dryer, thereby transferring a portion of the fabric treatment composition into contact with fabrics in the tumble dryer during a tumble drying cycle; characterised in the provision of reservoir charging means (301) comprising one or more charging conduits (60) for directing fabric treatment composition to one or more regions of the transfer means.