Imported from 3D warehouse -- and SketchUp and AutoCAD says it's not a solid object. How Fix?

SketchUp Pro
1

Key Merge Working Model.dwg (1.6 MB)

What’s wrong with the file?

2

Fix all the stray edges and such.

Screenshot%20-%2010_23_2019%20%2C%206_00_18%20PM
Screenshot%20-%2010_23_2019%20%2C%206_00_18%20PM1257×685 47.4 KB

Screenshot%20-%2010_23_2019%20%2C%206_00_39%20PM
Screenshot%20-%2010_23_2019%20%2C%206_00_39%20PM1230×671 37 KB

What is this thing? If it’s something you got from the 3D Warehouse, it looks like a thing you could model better than it was.