Just connected to sewage. The pipe to the old septic system was capped but left in the basement wall. The plumber's recommendation was to leave the pipe rather than take the chance of water leaks where the pipe would be removed.
It would seem to me that a properly performed patch in the cinder block wall should not leak. If I drive out the 6" cast iron pipe, what must be done to patch the hole and be sure not have a water leak?
