greetings. 2 years ago, i had to have my air-con system re-done and since i am in canada, r-12 is not obtainable because it is no longer legal here. the shop that i deal with retro fitted my system with a product called fR-12. it's brand name is frigic. it works great and is one of the drop-in replacements for r-12. all that was needed was to change the input valves on my compressor. check out frigic online and try to find a shop that uses it. the whole conversion process took about 10 minutes! i am completely happy with it. just my $0.02. mike cutting 11434