Broken Vac Line Connects To ?
 

I Recently bought a 2001 Audi A6 Quattro with low miles (93000) and some vac lines are broken, one of which is part number 078 611 933B its a 4 - Prong non-return valve that has broken at the right side of the T. like the picture shows

Attachment 32385

and here

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now i know where to get the part, but i dont know where it connects. It wasnt there when i bought the car so I have no idea what it connects to. I think it goes to the Vacuum reservoir on the bottom, because there is a nipple on the bottom of it that has a connection available but nothing connects to it. heres a picture.

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and here

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any help would be much appreciated cause i have to make a teporary fix until the new parts get in on wednesday. Thanks a ton Guys!