What is this?

[Underwoodr]

Hi there, can anyone tell me what the green ball thing is for in the top left of the image,
http://oi44.tinypic.com/2h6rmrn.jpg

I only ask as mine seems to be disconnected from everything and I'm pretty sure it shouldn't be, otherwise it wouldn't be there :P

Cheers

[DubNut1982]

It's a vacuum reservoir. If you've got a Weber carb you can run without it. 2e2 carb and it's needed. You can run the vac line straight to the connector on the airbox.