My Raceline water rail came fitted (second hand) with a round (no tabs to help you undo it) Motorcraft radiator cap. It is marked "Motorcraft 100" and the part number "06390". The theromstat housing it is fitted to is one from a crossflow.

Anyone know what this may have been fitted to originally ?

I'm just trying to find out the pressure rating (I suspect it may be 0.9 bar as per MK1 Fiesta and Escort)

thanks

picture if it helps
Rescued attachment wrail.jpg

Just guessing, but Mk1 Fiesta XR2 is a good bet...

Ta, I'll ring round a few places next week to see if I can get a bit more info.