I called the dealer, but they were no help. (Maybe I didn't explain myself very good.)

I searched for a while on this site, but didn't see exactly what I'm looking for.

Here is my question...

84 300D (turbo).

There is a hard, plastic, clear (OK, not so clear) vacuum hose that runs from the back of the intake manifold to a switchover valve (according to Haynes). The valve is located on the firewall, driver side. Haynes calls this tube a "delivery line from intake manifold" and is part of the turbocharger system. (Another hose goes from the switchover valve to the aneroid compensator in the IP.)

Can I replace this hose with regular rubber vacuum hose, or should I get special?

If I need special hoses, is the dealer the best source or are there other sources?

Also my hose seems to have black stuff all in it. I don't think that is good, but it almost looks so perfect that you could almost convince me that it's supposed to be there.

Anyway, I have to ask... should it have anything in it or should it be clear and open?

__________________
1984 300D 398K-daily driver
1998 Honda Accord 102K -wife's daily driver
1991 Volvo 740 289K
2000 Toyota Corolla 143K