Installing a Toilet Sewer Pipe

Written by steve sloane
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Installing a Toilet Sewer Pipe
Toilet sewer pipes are connected to the main sewer line. (techno toilet image by Paul Moore from

The first part of a toilet sewer pipe (or sewer line) is the toilet flange, which is screwed to the bathroom floor. This looks like a pipe with a flat lip that is attached to one end. A 90-degree elbow joint is glued to the flange, which in turn connects to a length of sewer pipe that reaches over to the house's main sewer line. The toilet sewer line and main sewer line are connected together, with a connecting coupling.

Skill level:

Things you need

  • Tape measure
  • Pencil
  • Power drill
  • 1/2-inch wood bit
  • ABS glue
  • 90-degree ABS elbow joint
  • ABS sewer pipe
  • Hacksaw
  • Work knife
  • Rag
  • ABS connecting coupling
  • Drill gun
  • 1 5/8-inch galvanised screws

Show MoreHide


  1. 1

    Mark on the bathroom floor the precise location where the toilet flange hole needs to be cut. Follow the toilet installation booklet regarding how far from the back wall the hole needs to be. Rest the flange---lip at the top---over the mark, and draw a circular line around its base, on the floor. Drill out the flange hole, using a 1/2-inch wood bit.

  2. 2

    Push the flange into the hole so its lip rests on the floor. Apply ABS glue to the flange's inside bottom. Also glue the outside male end of the 90-degree elbow joint. Push the elbow joint up into the flange, and hold for 30 seconds.

  3. 3

    Glue the inside female end of the elbow joint, and the end of a new piece of sewer pipe. Push the pipe into the elbow joint, and hold for 30 seconds. Cut new pipe and connect with couplings so the new toilet sewer pipe reaches over to the house's existing main sewer line.

  4. 4

    Mark the main sewer line at the point where the toilet line will connect into it. Cut through the main sewer line at the mark. Be sure the cut is straight. Use a work knife to remove any burrs, and wipe each side of the cut with a rag.

  5. 5

    Glue the inside of the connecting coupling. Glue also each side of the cut in the main sewer line. Push the coupling between the cuts, and make sure the coupling's spout is accessible to the toilet sewer pipe. Hold the coupling in place for 30 seconds.

  6. 6

    Glue the inside of the spout and the end of the toilet sewer pipe. Push the pipe into the spout, and hold for 30 seconds.

  7. 7

    Attach the flange lip to the toilet floor with 1 5/8-inch galvanised screws. The toilet can now be installed over the flange.

Tips and warnings

  • The connecting coupling has a spout on its side that allows for the new toilet sewer line to be attached to it.
  • If your existing main sewer line is PVC, use PVC for the new toilet sewer line. Prime all joints first with PVC primer, and use PVC glue.

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