A 90-degree female flare swivel adapter in AN4. The elbow lets a line leave a component at a right angle, which is often the only way to clear a rocker cover, chassis rail or turbo housing without forcing a tight radius into the hose. Because the joint swivels, the elbow can be torqued down and then rotated through a full circle to point the outlet wherever the run needs to go, so you are not limited to whichever direction the thread happened to stop at. Typical AN4 uses are turbo oil feeds and gauge lines in confined spaces. Both connections use the 37-degree AN flare seat; confirm your mating parts match.