2 air ports near front drivers side tire?

Curious about two air valves near my front drivers tire, I know the lower one is for my driver side air bag. (The passenger side has its own valve) What could the upper one be for?
-the hose goes straight through the floor and disappears under the drivers area carpet.
The label only says 90 psi
It is a 1987 Establishment on a P30 chassis

I tried to attached a photo-but don't know how!!