A blank coupling would be required for all extra non-powered implements.
If the implements are powered, for example, the rotavator, then an additional coupling would be required instead of the blank coupling.
Please note: The BCS 660 and 750 power units have inbuilt implement quick coupling, which is a different system to this - see here for details. This also applies to the CAMON C15.
Which power units is the blank coupling suitable for?