The little section of hard 'hose' could be instead of a rubber one getting crushed in the grommet.
No, it's a discrete section of drilled nylon bar. It's white, smaller than the black hose (which I thinkis somethig like 1/4" ID) and the two black hoses (underhood, underdash) push onto it.
THat's the weirdest thing about it. It's a total crock. You assemble by pushing the white nylon tube into one hose (say, under dash, from the checkvalve), push the nylon tube through the hole in the firewall -- no grommet! it doesn't seal at all! -- then push the hose from the foot bulb onto it. Of couse you have to hold it in place while you wrestle the hose on ... picture one arm fully under the dashboard, and the other fully into the engine compartment... ahem.