4" id black PVC pipe cover

4" id black PVC pipe cover that I'm using to create sort of a sci fi themed room.  I have a radon system that is unsightly and other than boxing it in, I'd rather try to integrate this into the space.  This might take some modifications to fit your needs.  It does look better than a fat dirty PVC pipe.

They are beveled so they stack easily and the radon base is designed specifically for my application.  Feel free to mod to fit yours as needed.