THE SHORT ANSWER
A sewer cleanout is an access point that lets a plumber inspect or clear a drain or sewer line without removing a toilet or opening the pipe. It may be outside near the foundation, in a yard, or in another accessible spot, depending on how the home was built. Look for a capped pipe at ground level, but do not assume every cap is a sewer cleanout. If wastewater is backed up, do not open a cap under pressure or stand in the discharge path. A plumber can locate the proper access and decide whether cleaning or a camera inspection makes sense.
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For more context about this type of plumbing issue, read our related Oklahoma City guide.
Read the related VIP plumbing guideEducational information, not a remote diagnosis. The right repair requires an onsite assessment. Plumbing conditions, safety concerns and local requirements vary. Stop using unsafe equipment and seek qualified help for gas, sewage, electricity or flooding hazards. See how we develop and update our homeowner guides.
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