I just have a question about sewage pipes reducing. My kid bought his first house recently and to say the inspector was incompetent would be an insult to the incompetent. I repointed out most of the things I new would be unsafe, actually fail code or he just might want to replace before it becomes a problem. In our look over I noticed the something I've never seen before. Starting from the 1st floor drainage to the exit sewage pipe that exits out the basement wall 3ft off the basement floor that leads to his septic tank runs from 3" to a 18" drop to a 14ft 4" pipe that at 12 1/2 ft-ish has a reducer to a 6" long 3" section that transitions back to a 4" exit y cleanout. Is the 4" to 3" to 4" an issue? Seems like it'd be a choke point.