ASneakyGoomba

Hello,
I am in the process of installing a oem airbox back into my car. (i bought the car with a k&n one). Anyways, I have everything figured out except for one tube. It is the small black tube that is coming out of the side of the air box. Can be seen in this picture
So I am wondering if anyone knows the part number to this piece or could go look on theirs to see if it has any sort of identification on it. I went to my audi dealer about this and they were absolutely no help.