Manufactured in accordance with specifications of Society of Automotive Engineers. A long nut is available for applications with excessive vibration. To make a connection, place nut with threaded end toward tubing end to be flared. Flare tubing to create a 45 degree flare. Tube flare is clamped between nut and fitting flare when screwed together. A leak proof, metal-to-metal joint is created when assembly is tightened with a wrench. Disconnecting and reconnecting do not weaken the fitting joint.