The Rigid that Stan shared seems to be the standard fair, whether you find it at Harbor Freight or on a tool truck. I have one that I believe I found on a Cornwell truck, that has similar diameters to the tool that Jerry shared. Super tight radiuses. Really make for a nice job.
Add a tubing straightener, buy tubing by the roll, and you can plumb from the rear axle all the way to the master without even thinking about buying a union!!
