http://www.gts-welco.com/gtsweldssto...gun-2040.aspx?

why is this so cheap? I'd like to be able to do aluminum and this is about as much as I want to pay. It looks like I'll have to do some rigging to get my welder to hook up to it http://www.mig-welding.co.uk/forum/s...ead.php?t=8472