For those nitpickers, I believe it is legal to top up an R12 system in normal maintenance, and I know of a guy with some but I am not telling.
It is illegal to refill an empty system. Similarly, you can empty it and refill with the captured gas if doing maintenance, eg removing the engine.
However Many aircon places have tossed away their R12 recovery gear as oil etc is incompatable with R134A.
Regards Philip A
