Male by male flared elbow, 5/16″ SAE flared male both ends.
Used to create bends in copper piping that are tighter than a standard tube bender. (90°)
also can be used to attach a flexible hose to the end of the copper pipework at a 90° angle.
Also available flared nuts (06-05) or as a kit 18-05N (which includes the union and the nuts)