A brief demonstration video of the Numatic JVP-180-11 which will be going up for sale. Apologies for the audio I wasn't really aware of how loud the machine would seem on camera. It's actually pretty quiet.
Well the dry models use the same motor so it's a matter of capacity and included tools amongst James, Hetty, Henry, etc. The Wet/Dry models like George and Charles use a motor that has less airflow but higher suction to allow them to pickup liquids more efficiently.