Apparatus, including an enclosure, a fluid-tight bag located within theenclosure, anda fluid-tight valve connected to the fluid-tight bag. The apparatus also has atube, having afirst end connected to the fluid-tight bag via the fluid-tight valve, and asecond end connectedto a balloon within a breast implant fitted to an implantee. The apparatusfurther includes aspindle, located within the enclosure, connected to the fluid-tight bag, andconfigured torotate under control of the implantee so as to roll the fluid-tight bag ontothe spindle or tounroll the fluid-tight bag from the spindle, and thus transfer a fluid,contained in the balloon,the tube, and the fluid-tight bag, therebetween.
