I have a Question. Why do plumbers, more notably in the south and in rual areas use ABS pipe? In the North we use sch 40 pvc.The only time we use ABS is on trailer homes(which plumbers do not install) or on the initial take off on the exaust of a larger power vent water heater. Maybe, because it can with stand more heat and being in the south it's warmer? I never understood this. I guess I'm just use to the way I've been doing things.