My early 1950's house is 2300 square feet, on a corner, U shape. It has two plumbing lines to the main. One side of house is kitchen and washing machine line. Cleanout on outside wall. Plumbing line #1. Other side of house has 3 full bathrooms, Cleanout on outside wall. Plumbing line #2. However, the master bedroom has a second small closet with a cleanout on the wall in that closet. Why there? Nasty for routing a line. Any ideas? Interesting point is I was told by an original owner that my street had such well built houses because "Yankees built them." And yes they are well built homes. Houston area