Hey Larry. I do not know, but it appears it's a compression crimp into the tube, thus you replace the tube AND fitting. I will let others reply. Since it's a linear movement, crimp is fine, but not "normal" in aviation.
PS, I see no screws/rivets/etc. in the picture, there should be at 1/3 of diameter or 1/4 diameter.
Just my 0.05$ (we don't have pennies anymore....sorta...in the US)
;-)