compressor suction source?

[cactus_mole]

Anyone know what this is...I guessing it's a vacuum source, idk.:dunno:

 

[Nick M]

What are you talking about? The compressor on the turbocharger? The A/C compressor?

 

[cactus_mole]

I dont know what i'm taking about too, all I know is on the instructions that came with my boost controller it said for the (out) side of the controller, to hook it up to a compressor suction source...