O sorry. Now I know what is being referred too.
Yea, I don't know what that is either.
Edit:
http://www.planetporsche.net/reviews...oduct=99&cat=5
Ken mentions that it is a charcoal canister in this article, assuming that is the same thing the OP is talking about.
I found online that charcoal canisters are used to trap the fuel vapors from the gas tank until the engine is started and then the vacuum of the engine pulls the vapors into the engine.