Starting from the left its 1,2 is the one pointing down and 3 is the right one. I tried hooking it up with no bleed, just an open port and i got crazy minimum boost, so i don't know how ppl are running it vented to the intake. The bleed is just the hallman's barb with the one end blocked so it won't bleed anywhere else but through the tiny hole. Boost response is just as responsive and more reliable with the bleed. With the port capped off like ride's and with the hallman running w/o the bleed hole, boost would climb rapidly, then stop for .5 sec. a few psi before the target, then explode to or sometimes a little past the target which was waaaay too unreliable.