I have a Weinsberg CaraLoft which is a very similar motorhome made by the Knaus group.
I don't have this pipe within my services locker though.
I have had a look around on the internet and can find a user manual available for download. I did find this video which also shows the pipe you're questioning...
Below the services locker you have the drain pipes for both the grey and fresh water tanks.....I can only guessthat the pipe you're questioning is some sort of overflow drain pipe????
If you don't have the user manual, why don't you email Knaus in Germany directly for it or ask them the question directly. They were very helpful (English communicating) when I had reason to contact them in the past. They will want your VIN before helping you so they can be sure on the exact model and specification you have.
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