Replacing 4 inch main line from cast iron to ABS. The plumber will be installing a clean out outside of the house to clean the sewer line toward the city sewer . From reading in this forum, some of you have installed another outside clean-out installed to clean the sewer line toward the house direction also. Dual clean-outs one pointed toward the street , the other pointed toward the house.
There is no other clean-out in the existing plumbing other than going in through a toilet for a straight shot to the street.
If a clean-out is installed pointing toward the house, help me understand how that would not just push any future obstructions toward the house if a plumber snaked the line in the future.
The house has a crawl space .