This is a pretty good video of the pipe.
https://www.youtube.com/watch?v=6rw_gHIt23U

Found it.

Spoke to mate who did the same thing on his A6 and he used this part number 059121086f.

http://img.photobucket.com/albums/v7...ps907e00ec.png

I'm 100% sure I broke this on mine within a week of getting it.
It was a case of buying a whole new pipe and I remember struggling to get the part number.

EDIT* The only hoses on my bills are 4E0121103J and 059121086F they are cheap <£10 each
That's no. 25 and 29 on EKTA
Is it this?
http://allegro.pl/audi-a8-d3-3-0-tdi...091477442.html
http://img14.allegroimg.pl/photos/or.../24/3997462451

I was just about to dig through ETKA ;)

Go to Audi first thing in the morning or give them a call and you will have it on Wednesday +++

Sanpdragon, yup thats it.

M-A8, 50 minutes to go and I'll be on the phone.

Hi Scott
How dis you get on?? Pipe fixed??

All done mate.

Took 5 minutes to do but it would keep breaking as it was really brittle.
Possible a good thing to replace.

Good stuff +++