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Sewer stoppage will be towards the city's sewer main.
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A clean out is plumbing access to structures main sanitary sewer drain piping to allow cleaning entry point when a stoppage occurs.
Sanitary sewer clean-outs are located at the following:
Both are located outside of the foundation.
Older structures will have a 4 inch cast iron pipe with a hub and brass threaded cap. Newer structures can have either a 3 inch or 4 inch PVC pipe with a brass cap, PVC cap, or rubber cap.
For rubber caps, take the steel band off cap with a flat head or common screwdriver. For PVC caps, unscrew with a pipe wrench, channel lock, or large crescent wrench.
A brass cap is the same as the PVC caps. Most brass cap threads will lock into cast iron pipe making it difficult to remove if not impossible unless threads were lubricated prior to being installed. Sometimes the best and easiest way to remove the brass cap is to bend it slightly enough to drive a flat head screwdriver into the threads and pop the cap off the clean out. "Do not drive cap into clean-out or drop it down into the cleanout as this will most definitely cause a stoppage.
Most Residents have a double clean out with two clean out stacks. The stack closest to the foundation sweeps away from the house and towards the city's sewer main. The stack farthest from the foundation sweeps towards the house to allow cleaning under the house.
Sewer stoppage will be under the house.
99.9% of the time sink stoppages are internal problems and need to be taken care of by the residents, this is not a City problem.