Anybody own a greddy type s BOV?

i need to know what the second vacuum fitting on the valve is for..
the one goes to the intake and the return hose for the turbo but there is one more fitting i need to know what for thanx!

o and i forgot to add the adjustment on it, should i turn it halfway and start from the to get the right psi im lookin for or all the wa in one direction?

this was just covered...

http://www.automotiveforums.com/vbulletin/showthread.php?p=1791093