- 1). Use a pen to mark the point on the main sewer line where the new sewer pipe will be attached. Make a second mark two inches along from the first mark. Use a handsaw to make a perpendicular straight cut through the sewer line at both marks---the cuts will be parallel with each other. Remove the two-inch section of pipe. Scrape off any fragments or burrs from the existing pipe ends with a utility knife.
- 2). Brush PVC primer around both outside ends of the pipe cuts to a depth of 3/4 inch. Then prime the inside ends of a PVC connecting coupling. Brush PVC cement on all four primed areas. Squeeze the coupling between the pipe ends so that the pipes enter into the ends of the coupling. Position the coupling's side spout up and facing the direction of the new water inlet. Hold the coupling in place for five seconds as the cement sets.
- 3). Measure and saw the first section of new PVC sewer pipe to length and scrape off burrs. Prime one of its outside ends and also the inside end of the coupling's side spout. Cement both primed areas. Push the cemented pipe end into the spout and hold in place for five seconds.
- 4). Saw the second new section of PVC sewer pipe to length. Scrape off burrs. Prime one outside end, the remaining outside end of the first section of pipe and the inside of one PVC straight coupling. Cement all three primed areas. Push the coupling onto the end of the first pipe section and then push the cemented end of the second pipe section into the other end of the coupling. Hold in place for five seconds. Measure and saw to length all necessary pipe sections, installing them together with couplings, primer and cement, until the new pipeline reaches the water fixture.
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