What Am I-----?

Question

I am found on all Aussie grounds, I suppose most others have them. I am only in use on special ocassions, & used by the one person generally.Supporters do not like to see me, but I play a vital role.There is only ever one of me.

Answer 1

Umpire's finger pointing to the change rooms?

Answer 2

The thing that sucks up all the water.  What is it?  A super-sopper?

Answer 3

Yeah my guess is also the super-sopper! or the tractor...

Answer 4

super-sopper

Answer 5

dont know

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