Tubes in Vents

Gary and I had discussed the "tubes" inside the vents of a type 2. They resemble a refrigeration line with a drier sweated in the middle. As seen below it's part of the fuel system.

Common responses taken care of for your convenience.
TheSamba: You didn't know what that was? Dumbass. What are you doing owning a VW?
Fullmoon: Damn, I cut those out.
ShopTalkForum: What size high performance crank are you using?

Good find.