Italcarguy:
The hose off the cap on my GTA, original from when I got the car, is 25.4mm or 1.0 inch, in black rubber. On my car it goes from the cap to the inlet on the FIA recuperator tank, which is mounted on the inner left fender. If you need anything ref GTA's, email me direct at
davidrivkin9@aol.com. Have fun at Monterey. Ive entered mine at Watkins Glen where Alfa is the featured marque.
David