This is an adapter for a 50mm spiral hose. The vacuum hose can be changed quickly and rotated 360 degrees. I attached a vacuum nozzle as Fusion360 file, so that it can be easily adapted to the required diameter.
In order to mount the secondary air part, a little force is required when plugging together.
On the underside of the adapter there is a left thread M58x4 where the spiral hose can simply be screwed and glued in.
Printing as PETG is recommended.