I am talking about the standard brass compression fittings you see in the hardware store. If you are talking about the Swagelok company and their hydraulic type fittings that is completely different (yes that would work) but not a practical option, since I don't know of many places that handle that type of fitting or have the tools to properly "swage" the tube for the fitting. I would also have to guess that this type of fitting is way more expensive than simply flaring the tube. You could easily go to the phone book and find any equipment repair shop or hydraulic shop an they'll flare it for you. Also, most NAPA stores can do it as well(at least the ones where I live can, WI). Or as stated earlier just flare them yourself. The tool is very cheap and although flaring steel lines is a bit harder than aluminum or copper it's still very easy. Just practice on some junk tube first! Good luck.