600 Holley vent tube question

Those tubes pull right out, removed a few to ship in a box that was 1/2" too short. Marine carbs have that tube shaped like a bridge to tie both tubes together and drain back into the venturis. They are shaped like that to allow the direction of intake flow to flow across the chisel tip and cause a slight vacuum to pull vapor out the bowls, like the old downdraft tubes of the slants and old Y block Fords