Eureka Atom Blow Up System Hopper And LidEureka Atom Blow Up System Overview Designed by Eureka as a tool for maintenance of the Atom series grinders, the Blow Up System Hopper and Lid are a unique accordion style hopper that allow you to blow air into the grinding chamber to push out any loose coffee grinds. Used in place of the traditional hopper, this system is ideal for minimizing grind retention. 300g Capacity Compatible with Eureka Atom Espresso Grinders