[Missed Approach]

Hi Barrpete- The fitting you have shown fits into a u-shaped metal bracket that holds the tank in place above the washer tank. I have a few shots from my removal... http://forums.pelicanparts.com/porsche-911-technical-forum/987971-weak-washer-system-solved-mold.html It's actually a clever way to keep the upper portion of the expansion tank in place- just look for/feel for the u-shaped clip in the upper portion of the wheel well.