What is this?
I know someone has asked about this before but I couldn't find anything about it because I don't know what its called. But whatever it is, mine is completely destroyed and I need a new one.

Thanks guys.

Thanks guys.
You should be able to go to your local automotive store and pick them up as they are universal. Double check the size but I punched in "1/4 check valve" and "vacuum check valve" in the search on ebay and a lot of different ones came up. They also came in 1/8 size.
It is a one way check valve and no reason to get a used one for the price of a new one at a parts store. The 1/8" one will be significantly smaller so you will notice right away if it's not the right one. Also no need to make sure it's for an Audi the ARE universal.


