Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

I have A corsa 1.6 16v Sport ( Black Rage )

On it is a water expansion tank with three pipes:
one large on the bottom
two side by side

The smaller of the two on the front is a sorta u shaped piped when held up and i cant seem to find where it goes if it goes anywhere??

any help would be great thanks

radiator overflow?

that was one of my thoughts but it has a clip on the other end :/ like it goes into somin else :O i really am lost :L

sorted the pipe it went on the throttle boddy for cooling i think :/ or as a breather anyhow its on and i finished up and the car runs its ticking abit so im gonna have a look at the timing again but i hope itll all be ok should be tip top tomoz

edit, never mind if its sorted

lol i just wanna make sure This HG will survive