compartment

Battery compartment seem to get water collected from somewhere. Can't see any leaks from the middle break light area or on the carpets on the boot. There is also a small rubber tube that seems to have got disconnected from some where. Any idea what this tube do and how the water get collected?.

Hi everyone, I am trying to track down some beige plastics for my 2000 1.9l Z3, so that I can fit some roll bars to it. I was going to then buy a wind deflector. At the moment, it has the full length compartment. Do I need to get the smaller compartment size in order to fit them? Thank you...