There are many benefits to having an outside cleanout:
Outside cleanouts provide a full-size access point for effective sewer rodding to remove tree roots and other blockages. Because many sewers transition to a larger size outside, the outside cleanout allows the entry of a full-size rodding cutter to clear the entire diameter of the outside sewer pipe.
With an outside cleanout, you avoid possible water damage and pipe damage when rodding is done from an inside cleanout.
Outside cleanouts prevent a mess from being made in your home. When rodding from an outside cleanout, there’s no need for technicians to prep the area like they would do if rodding from an inside cleanout. Any overflow will occur outside your home – not in it!