Pure Choice Motorsports designed these fittings to convert from tubing to AN without flaring the tube, the -6 AN are manufactured in Stainless Steel while the -8 are available in steel. Will work on steel or stainless steel tubing.
P/N 5690 1/2" tube to -8 AN male
P/N 5770 3/8" tube to -6 AN male
P/N 5780 5/16" tube to -6 AN male