The first time I came across this fitting I was unsure of what to do. Without doing my research I ended up busting it up. When I came across it a second time I thought I better find out what this fitting is all about.
Step 1: This Is One of a Few Styles of Tools Available to Release These Fittings.
There are a few styles of these tools available but I found these to be the best value for money.
Step 2: A Clip on How to Use These Tools.
After finding out more about them I now quite like this style of fitting. They are neat looking do a good job and are easy to undo. I hope you find my Instructable before you like me bust up one of these fuel\oil fittings.