Just noticed this is all split.

 

What is it basically?

I think it's the purge control valve.  Reconnect it all lol.

Well thats why im asking as the tee has snapped so im wondering what it is and why havent i noticed anything when driving ect

 

Il fetch a new tee tomoz and fix it 

Not sure what the symptoms would be but least it's an easy fix.

normally connect a boost gauge around that part so I would say will have boost issues being loosing air out of it anyway.