A fuel dispenser includes first and second cylinders adapted to contain respective first and second fluids, one being fuel and the other being a fuel additive such as a lubricant. The main body is configured to accommodate toner therein and that has a main-body-side communication through-hole, through which an interior and an exterior of the main body communicate. A surface of the cage contacting the vertebrae has an undulating shape for limiting sliding of the cage in a plane parallel to the vertebrae faces.