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Can you tell me the pressure rating for the resevoir "radiator" cap? My current cap is stamped 0.7 which I am certain is 0.7 bar. It no longer holds pressure. A replacement that I just received from a reliable vendor is stamped 0.5 bar. I verified it to that pressure with my testing equipment.

The only thing I find on cardisk is a system test pressure of 1.1 bar.

Normally Aspirated engines 0.7bar, turbo 1.0bar. In my experience.

There are many different ones available. Just start looking for one with 0.7 or slightly greater. Obviously running a too high pressure can cause damage to the engine or other parts of the cooling system. Newer cars run much higher pressures (1.2 etc) so I think best is 1 or close to.

This is the size of the Alfa cap. Maybe this will help you find a replacement part.