This is a Ford FE oil fill tube that has been brush polished. 

Unlike some of the other oil fill tubes, this is designed to look and act as Original Equipment (O.E.) replacements. 

These have two baffles installed inside to keep debris from entering the engine. In other words if something falls into the engine and passes the first baffle, the second baffle that is facing the other way will trap it inside; this is the way Ford designed it, and this is the way It's made. Like the original Ford pieces mine are tapered on the end for easy installation.

What you were purchasing:

1) Ford FE oil fill tube (as seen in picture) with two baffles installed, 1.380" O.D.