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What are these for on these carbs?

1044 6
I'm talking about the hoses on the bowl vent tubes?
http://members.aol.com/macstang/Gifs/carbs.jpg

You can see my 65 fastback at: http://hottarod.stangnet.com/
http://members.aol.com/macstang/Gifs/macstang6.jpg
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