Edelbrock 1406 hose hookup

On the electric choke there is a nipple at the 5 o'clock position.
It is shown in this picture. http://www.forabodiesonly.com/mopar/attachments/elec_choke-jpg.1714738803/
OOps, that is a picture of a Holley, but it looks the same as my Edlecbrock

Where does the other side of this tube hook up ?
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The guy I bought the carb from, rebuilds these for a living. I am pretty sure that he said not to put anything on the nipple.

I have recently had problems when SOMEONE,unknow to me put a hose on this that did not belong there