Abstract: For repairing a drain or pipeline defect (which in the illustrated case is a major collapse, but may be a minor leak, hole or other defect), after cleaning by high pressure water or other methods and/or after reaming out the drains or pipeline, an ejector body is pushed by rods or is drawn into place by means of a hauling cable until its leading end is to one side and its trailing end is to the other side of the detect. Thereupon, sealing rings are inflated to seal the body's ends, and the components of a multi-component hardening composition are supplied by way of ducting so as to meet and mix in the body and emerge through holes to fill the entire defect and any registering voids in the surrounding earth. Before the composition is fully set, the body is displaced along the drain or pipeline, and the remaining hardening compound serves to replace the defective or missing drain or pipeline material. After withdrawal of the body, the repair may be reamed again, and/or polished.