A Cleanout (or Rodout ) Station is an access point which is installed on you main sewer line. It’s purpose is to maintain and also repair ( in some cases ) a main sewer line. Many people have tree roots within their main sewer line. It takes a hole the size of a pin head for roots to invade a line. Once it has ,it feeds and grows. Think of a 6″ brillo pad made of tree roots . Once a line becomes infested with roots , maintenance & blockages become a regular problem. It is like having hangers stuck in your line for everything from toilet paper etc … to get hung up on. Cleanouts provide access close to the source of the problem allowing for rodding both forward to street and backwards to the house eliminating most of the roots that can not be done so normally.