http://www.walkerproducts.com/_pdf/rochester1barrel.pdf
page 16. Part 25

It's a small constrictive tube that sits in the fuel bowl that is supposed to suck in the fuel for the idle circuit.


69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.