EGR valve vacuum line question ?

Hi, Using the excellent info I have picked up here from various threads, i have been ovehauling the EGR system on my son's Fabia (as it has all the usual issues to do with this it seems), but have hit a bit of a query.

Car is 01 Y Fabia 1.4 16V Comfort - AUB engine.

My query is that everyone (& Haynes) mentions the vacuum connection on the EGR valve, & sure enough on our EGR valve there is a tube port on the side which has rubber connector to thin plastic tube and this then goes.... er, nowhere ?

Its quoted as going to the air intake as a vacuum line which i presumed to be the inlet manifold (same as other vacuum connections) or maybe even the air filter box, but it just ends in a small cylinder which looks to be a filter I guess. I've lokked everywhere & cannot see anywhere it coudl possible connect to, so is this correct or are we missing something. Is it not actually vacuum driven & this is just some vent line or something?

Would be appreciated if anyone can clarify for us. Thanks