Melitta Caffeo CI 970-101 - Drainageventil

Hello dear experts,

I have a question and I disassembled my machine (Caffeo CI E970-101) to replace the hoses. This has also all worked. To do this, I replaced the drain valve.

But now it is very strange that the expansion chamber does not want to hold on the new valve. Somehow the black part does not lock onto the drain valve.

What can I do? Or rather, where can I find illustrated instructions on how to use it?

Love
Knut

Here the valve

There are no instructions for this. Put it on, turn it into position and you're done. If it doesn't hold, the nose will be off at the expansion chamber. Will it hold on the old drain valve?

I think my problem is that the black part has a gap between the hole and the nose, so the thing won't hold.

Is this nose still present?

bought me a new one and changed, that worked then!