This is a -6 ORB (-6 AN with O-ring) to -6 AN adapter fitting. It’s aluminum and anodized black. These are commonly used on fuel pressure regulators and some fuel rails or anywhere else that you need to convert from a -6 ORB to -6 AN.
-6 ORB to -6 AN Adapter Fitting – Black Anodized – WARR Performance 47-0089
