you can buy one from HF for $90. Actually they have one for $18 that runs off compressed air. Sounds like it works ok if its 95F+ outside and you have at least 125PSI. I have a friend that is a refrig service guy. Need to see if he has fitting for R12. Was thinking of converting my Duster to 134a, but it was holding till I moved things around. I might just go through and tighten everything good and recharge with 12. I see lots of it on ebag...