jimmyt - Yeah, I always thought plumbing was kind of fun. It really is now that they use glue-together plastic pipe, and you don't have to cut and thread galvanized steel. It was a real pain-in-the-ass to measure, cut, and thread the old way, and then find out you were a 1/4 of an inch short, and had to put in a union where you might have gotten by with a coupler.

               It was always a challenge to get the length just right, so you could get just the right number of revolutions on the pipe to prevent leakage, and still keep every thing lined up.

               Civil contractors like myself always ran the sewer in the street at a 1% grade, the the plumbers would take over with architechual drawings and plumb things at 1/8 of an inch to the foot. But it all figures out pretty much to the same grade.

                Of course, Joe the plumber would know all of this.