This is a Greenlee Quad Bender, about 6000 bucks, bends electrial conduit ,thin and heavy wall up to 2 inch (2 inch conduit is about 2-1/4 od).I have used these to bend conduit for use on exhaust systems,with the contractors permission of course, lol. Thin wall conduit is galvanized inside and out, similar wall thickness as exhaust tubing.But the bends are too large of a radius for close quarters. Exhaust tubing generally kinks in these machines , just not ductile enough for the machine.. [img]http://www.toolup.com/images/product/Greenlee/Regular/854.jpg[/img]