This is a vacuum adapter that connects a Delta 22-555 Thickness Planer to a Rigid vacuum hose.
The Delta has an output of just about 2 inches and the Rigid has a 2 ¼ inch hose.
This is a good friction fit and seems to hold quite well.
I had to print this part with a small brim because adhesion was not quite working well for me during my prototype sizing.
The author remixed this model.
I used the included OpenSCAD file to make a specific adapter for this setup. The only changes I made in the SCAD file were the parameters. Thanks to FollyMaker for the great model to start from - made it quite an easy process.