How to Redo the Plumbing to the Sewer Outside

Locate the home’s main sewer pipe, which is a whitish-gray PVC or plastic pipe that usually runs around 4 inches in diameter. Position a bucket underneath the area of the pipe where the “T” fitting will go. The top or crossbar on the “T” fitting becomes a part of the main sewer pipe, while the “I” portion or side passage connects with the additional drain line. "T" fittings attach to the straight areas on a main sewer pipe, which typically run in 8-foot lengths.

Place masking tape over the top of the side passage of the “T” fitting to prevent it from being scratched or damaged while you're working.

Measure the length of the “T” fitting's crossbar on the main sewer pipe and mark it on the pipe with a pen. Since the main sewer pipe will slide into the “T” fitting once it’s cut, the main sewer pipe length must extend into the inner ridged sections on the “T” fitting. Be sure to include the length of the inner ridged portions on the “T” fitting when marking the main sewer pipe.

Cut the section of sewer pipe out using a hacksaw. Allow any draining water to flow into the bucket underneath the pipe.

Smooth the ends of the cut pipe with a utility knife by scraping away any leftover shavings.

Clean off the cut sewer pipe ends with a cloth rag. Be sure to wipe away any moisture or debris left on the ends.

Spread cement sealant on the outside of the sewer pipe’s ends and on the inside of the “T” fitting’s ends.

Slide the “T” fitting onto both ends of the main sewer pipe. Allow time for the cement sealant to set.

Remove the masking tape from the extender part or side passage of the “T” fitting. Spread cement sealant on the inside of the end piece and on the outside of the add-on drain line.

Slide the add-on drain line into the extender portion of the “T” fitting. Allow time for the sealant to set.