what is this pipe

[stevedon]

i have a metal pipe @4mm which comes from the front and is secured by one of the inlet manifold bolts(second one along under neath) and conected somewhere to a vaccuum supply.My egr is gone and there is no pipe on the end of this one .Where should it connect

[Doone]

Have you had a look at the schematics diagrams ON THIS LINK?
You'll proabably be able to trace the pipe from the diagrams.