Project is building a shower where none is. Imagine a clock. The proposed shower drain will be in the center. Its 8 ft or so from the toilet at 12:00, 5 feet from lavatory also at 12 :00. 7 foot from the washer drain at 8:30, 6 foot from the kitchen sink at 2:30, I must be close! The cleanout is 11 foot away at 6:00. If there was a device I could send into the cleanout that makes noise, I would know where to cut the slab.... Or do I need to estimate and start cutting? How is this done? Does the main drain pipe ususally enter the house straight in from the cleanout and then tee to various locations? Or is every house drained differently depending on the mood of the designer? House built in 69, St Pete florida, block and slab. Cleanout is in back of house, city sewer.