What is this vacuum port for? (2jz Throttle Body)

[TBS]

Anyone knows what this nipple is for? (marked with red)
It is at the bottom on the right side, if you look at the Throttle Body from the front.
It ''comes out'' of the hole that's marked with yellow, and it looks liked it gets ''blocked'' in the TB gasket (also marked with yellow). If you understand what i mean...
Can i just leave it, or do i have to plug it?
I tried to follow some vacuum diagrams, but Could not find it..
Thanks

 

[TBS]

Anyone? Its a Aristo TB...

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[Radial]

From memory, this is the vacuum port for the vacuum controlled on/off valve on the Powersteering pump.
There is also one more port in front of the TB, just unerneath the TRC-tps, that connects to the other side of the Powersteering vacuum valve.
Once there is vacuum, Powersteering goes on. Once in boost, it shuts off.

Block theese vacuum ports if not using them.