JDM intake manifold picture

[SmoothRigoletto]

http://img.photobucket.com/albums/v57/SmoothRigoletto/preludehose.jpg

This is from a JDM intake manifold that i'm currently swapping and im stuck on this. Anyone know what this is or if i have to use it or not?

 

[SmoothRigoletto]

 

[801CRX]

Its a vacumm line
No you dont have to use it