R12 now days costs WAY TO MUCH MONEY!!!! It is illegal to release r12 into the air now anyway. Thats why new cars use R134a for air-conditioning. If I were to still use Rohm-air retracts, I would use the Robart valve instead of the original one that came with the system. It has been my experience that the valve(not the filler valve) was the weakest link for the Rohm-Air system.

P.S. If you find a virgin can of R12, put it on e-bay and see how much you can sell it for! It will make you sick (considering that it use to only cost 2 bucks per can- trust me on this one!)