Help me out? Distributer (OSAC) Valve

I have a 1974 Plymouth Duster 3.7l slant six.
Today I notices a tube from my carburator had come off.
I looked the name up in the manual, theres a small pipe coming off the carburator called a distributer (OSAC) vavle.

Anyways..
The black tubing fell of the pipe and I have no clue where to put the other end of it on.

So the tube goes from the carb to somewhere else.
My question is where?

Anything helps.
Thanks