Bill, the only reason why I asked, is because I knew I guy when I was in the Air Force, that put 502 in a 500 system, and blewout the valves on the semi...God I wish those days, when I could clean my tools in R-11.....
last time i bought a 30 lb jug it was over 900.00 so that worked out to 30.00 a lb wholsale. that was several years ago so i can only imagine what it is today.
I have one customer who still has some r-502 in use. Our local wholesalers have just stopped selling it. I found and bought the last 2 jugs that I could find. $239 per 30 lb. jug. I don't think I'll be finding any more for sale on the island. Therefore, I will be prepping those systems for r-404a so they are ready if a change is needed.