"Single" flare tools are used on copper tubing for low-pressure fluids. The tubing is simply bent open. "Double" flare tools are used for steel tubing, and are appropriate (Safer) for automotive uses such as brake lines and fuel lines. For automotive use, I'd get the double flare tool. They are harder to use, but much more reliable. They actually do a single flare, then you reposition them to fold that flare back onto itself, forming a double thickness seal portion. I do not believe that they can be used on copper tubing because the copper work-hardens too much to do the extra fold. Joe Savard Lake Orion, Michigan **************Ideas to please picky eaters. Watch video on AOL Living. (http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campos-duffy/ 2050827?NCID=aolcmp00300000002598) [Non-text portions of this message have been removed] To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: mailto:Chrysler300-digest@xxxxxxxxxxxxxxx mailto:Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/