[Ian C]

The Jobo Expert series of drums are all cog-drive-only, because they are intended by Jobo to be used exclusively with a cog-drive lift unit. The solutions are introduced into the drums while they’re horizontal and rotating. These drums are not intended to be filled upright. If you do so you will likely have problems with eneven development.

The lift unit of the manually operated processors fill the drum via an integral funnel and tube that conducts the solution into the drum as it rotates. The automated versions use air pressure to transport the solutions into the tubing and then into the drum. These drums are not intended for hand filling and emptying and there is no provision for attaching a coupling magnet on the tank bottom, which is the other Jobo rotation option on its processors that are not equipped with a lift unit.