My flaring tool for tubing does both double and single flares for AN fittings. I have always thought that the double flare had a little bit of compression from the nut/ferrel when you tightened it down giving an even seal. I took a piece of the 3/8" fuel line and did a double flare to see if the ferrel and nut would fit. They seem just fine. Anyone have any good reason why to not use the double over the single flare?

Thanks

Gary

Dbl Flare 1(002).jpgDbl Flare 2(002).jpg