Quote:
Originally Posted by vintageogauge
I didn't say the line was connected to my neighbors, the employee stated that. There is a trap outside as well as a clean out, the employees boss explained that to me. If there is a sewage backup from the street what prevents it from entering your home if there is no back flow device?
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I think the boss was wrong. Your toilet is a trap in itself. Adding a second trap in series to a drain would violate the plumbing code and would impede the proper function of the drain. Raw sewage, toilet paper, etc. would not flow very well through a drain pipe that had a trap in it. And, normally, there is nothing installed in a sanitary sewer line to prevent backflow. That is why insurance companies offer optional sewer backup coverage for your homeowners policy. I am just trying to explain the system as I understand it.