Downspout ground pipe grommet

This is a downspout grommet for square downspout and flex tubing, as available at Home Depot Canada.  The provided fitment is a real sloppy so I made a down and dirty grommet.  Without the grommet, junk might get into the ground drain.

Source code included, in case you wish to adjust or just want to see a parametric FreeCAD model.

This was printed in Polymaker white ASA.  No special parameters.