Membrane for heating valve and flow direction

[Overknasten]

Hi again. The mystery is solved, or at least I got the right membrane from the guys at Historic Racing Work. No one is able to tell me if this heater valve is used elsewhere in the huge Lancia family (including cousins and distant relatives), but now that i have it I am more than happy. I have a question to the forum, however. Which port is inlet / outlet? I have attached a picture with what I think is right but maybe I´m wrong?
Kr. Bjarke

[Huib]

I also connect it the way you indicate with the arrows.

[Overknasten]

Thanks a lot. It is truly a good week.
Bjarke