Which glue works well for attaching plastic valves (ventile)?

[ha-vent]

The material is called "Vileda" and is originally a German substitute for window cleaner leathers ("Vileda" is pronounced the same as "wie Leder" which translates as "like leather").

Hallöchen,
the material of the Hohner artificial leather valves is indeed "Viledon", which is slightly different from Vileda or Vildona.

 

[ha-vent]

As for the glue, we recommend using "leather glue" (Kövulfix, UHU Kraftkleber, etc) for both plastic and artificial leather valves.
The reason for this is, that it doesn't corrode the rivet and reed.
Just use a tiny amount, let it dry a bit and then stick the valve onto the reed.
Some acc. manufacturers use tinted instant adhesive.