So my local water supplier pointed out to me that I need a multi-duct house entry so that they can lay their water pipe in it.
I then also researched online and went from one thing to another.
So it is actually first about whether or not to have a slab foundation.
Then which (and how many) connections need to be included.
Then there are various manufacturers.
But with your slab foundation with four pipes provisionally, I found the following complete package:
Mehrsparten-Bauherrenpaket für Gebäude ohne Keller (Reihenanordnung)
Since I also preferred to buy the part myself, I turned to a portal that among other things sells such multi-duct house entries. link removed by moderation; Bauexperte helped me here.
I was lucky there, they seem to be connected with the energy supplier. They were even able to put me directly in contact for the installation of the entry with the electrical connection.