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I know kind of what it does but not 100 percent sure.

Any know ?

It catches oil coming out the breather on your crankcase and collects it in a little pot

Helps keep intakes etc clean of waste oil, supopose you can also see how much oil your losing out the breather

most used on turbo and high rev cars

Hope that helps

yeah it does abit, been offered one for £50 if i pick it up at Trax.

Just wondering if its worth getting one, as the corsa is being turned into a proper track day car.

just use a empty bottl

Can get em cheaper off eBay if you want a fancy shiney one, but as Ant says, you can just use a bottle. Normally crankcase and rocker breathers etc, vent back into the induction pipework of your car, burning the oil vapours in them which is supposed to be kinder to the environment than venting them to atmosphere. Not as good from a performance point of view though, so the catch tank is fitted and the vapours enter it and the oil collects in the bottom and the gasses escape through a small breather filter on the catch tank. The hole left in the induction pipe is then blocked up with a bung, or a different pipe is fitted altogether.

I always thought they were to show you when your vacuum pipes had split as all the oil it catches over the years just sprays all over your engine in one go hahahhaha lol

dude DO NOT pay £50 for one as they are a hell of a lot cheaper from ebay or even a trade stand at trax.
donny show last year there were loads of places selling them between £25-40 for shiney anodised ones.
if u want mate we can have a look around tommorow as i would like 1 as well.