I needed an adaptor to fit the Bosch sanding hose to my Bosch EasyVac system. It will also work for other Bosch vacuums like the Universal and AdvancedVac.

In my case, the shrinkage in the filament made it so that some air seeped through the sides but I fixed it with one round of electronic tape around the base of the adaptor. It would also be possible to make the diameter 0.5mm bigger but this was an easy fix with the tape.