Where is the ';Air control valve'; on a MK 3 VW Golf (petrol engine)?

It is a 2.0 litre 8v engine model (115bhp)Where is the ';Air control valve'; on a MK 3 VW Golf (petrol engine)?
It's this bit;





http://www.autopartswarehouse.com/mmp/vw鈥?/a>





should be connected to the inlet manifold %26amp; ducting.