Hello Ratio! Herz valves are M28x1,5, Eve Thermo comes with the standard M30x1,5.
You need an adapter:
Herz M28x1,5 auf M30x1,5
https://www.amazon.de/gp/product/B0028YCQNA/
https://www.wolf-online-shop.de/HEIMEIER-Adapter-fuer-Herz-Ventile::666.html
Best regards, Volker
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Aug 8, 2022