What is a red warning light that looks like a cylinder battery ?

In my Iveco lorry, I have a red warning light that looks like a cylinder battery (e.g. torch battery NOT car battery) and it is "filled" about 1/4 full with red. Does anybody know what this light means ?
Susan Mc, October 2008


done
by the sounds of it its a warning light to tell you one or more of your air tanks has excessive ammounts of water inside which shouldnt be in there but is caused by condensation.usually theres a bleed valve on the bottom of the tanks. pull the ring with a screw driver or plier until the tanks empty and water should drain out too

cheekybum1977@yahoo.co.uk, January 2009
link Click here to see other fixes for Iveco.