When and where?
EDIT:
When John's vacuum leak happened, there was a suggestion to replace all $hitty old tubing with new vacuum tubing (since your gonna be in there/under there anyway, right?) and I bought 15' of tubing as a kit from ECS (IIRC - it was $10 or something) and it had some T connectors and other connections included. I will look on ECS to see if I can find it. Better to be safe than sorry...
EDIT AGAIN:
found this but the prices went up ALOT!
http://www.ecstuning.com/Audi-RS6--4.2T/Search/Vacuum/