There seem to be several folks around ( some scubaboard ) that will help coach along a DIY portable compressor. I just have not had any luck finding a compressor in my price range. Where do you look for used or surplus compressors to build in to a porable unit? I have a relly nice 9 hp honda motor which I think would run well on a 6cfm or maybe 7 to 8 cfm if speed is reduced. What key words should I search? I really want a military type unit that is continus duty not a fill a tank wait to fill the next tank while it cools down compressor. This will be used where airfills are not available. I do realise it will be easier and cheaper to use the Dive Shops when ever possible.