Vacuum hose adapter (diameter extender/reducer)

Vacuum hose adapter customizable inner and outer diameter and length.
Common sized example (around 48 to 36 with tolerances) but freely customizable via included openscad code file.
Easy to use, download and install openscad, open the file, modify variable values, hit F6 to compile, view and
then File -Y Export as STL... to generate STL.
Hope this helps.