Attributes . Cut tubing squarely and clean tube end thoroughly to remove burrs. Place nut onto tube. Place threaded end of nut toward end of tube. Flare tube end with flaring tool to provide 45? flare. Clamp tube flare between nut and nose of fitting body by screwing nut on finger-tight. Tighten with a wrench an additional 1/4 turn for metal-to-metal seal. . Names