Hi Dimitris,
What I made up for my Fulvia would do you equally as well.
I used a 15mm copper Tee as used in domestic heating systems, 3 short lengths of 15 mm copper pipe and a brass bleed screw used for bleeding the highest point in a central heating system; it's dead easy to make, you solder the bleed screw to one short length of the 15mm pipe, then all three lengths of pipe to the tee with the piece attached to the bleed screw in the upright tee, job done, it's much easier to make then it sounds, see photos.
Brian
8227