How to install a shower drain pipe

Written by steve sloane
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How to install a shower drain pipe
Shower drain pipes are connected to the main sewer line (shower series. goofy in the shower image by Alexey Stiop from

The shower base has a circular rubber flange where the waste water exits. This flange is connected to a P-trap, which, in turn, is connected to a sewer pipe. The pipe is then connected via a connecting coupling to the main sewer line. The shower should be located so that its sewer line can reach and connect to the main sewer pipe. Be aware that the new shower sewer line should be installed at a gradient to allow waste to travel down the pipe.

Skill level:

Things you need

  • Hacksaw
  • Tradesman's knife
  • Damp rag
  • ABS glue
  • Connecting coupling
  • ABS sewer pipe
  • ABS P-trap

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  1. 1

    Saw through the main sewer line, using a hacksaw. Make sure the cut is straight, and remove any burrs with a tradesman's knife. Wipe any dirt from around the cut with a damp rag.

  2. 2

    Apply ABS glue to the pipe on each side of the cut, as well as on the inside of a connecting coupling. Push the coupling between the cuts, and hold for 30 seconds. Make sure the coupling spout will be accessible to the new shower pipe.

  3. 3

    Measure from the spout to directly under the shower flange, and cut a new piece of pipe to that length. Remove any burrs.

  4. 4

    Apply glue to one end of the new pipe and to the inside of the coupling spout. Push the pipe into the spout, and hold for 30 seconds.

  5. 5

    Push the P-trap onto the other end of the new pipe. If the vertical part of the P-trap is directly under the shower flange, take the P-trap off the pipe, apply glue to the pipe end and P-trap, and connect the pipe end and the P-trap. Hold for 30 seconds.

  6. 6

    Measure and cut a piece of pipe to connect the P-trap to the shower flange. Take into account that the length of pipe will determine the gradient of the new shower sewer line.

  7. 7

    Wet one end of the cut pipe, as well as the flange. Push the pipe up into the flange. Apply glue to the other end of the pipe and to the end of the P-trap, and push together. Hold for 30 seconds.

Tips and warnings

  • The required gradient of the shower sewer pipe can vary (usually 1 inch per 10 feet), so consult the permit office for the correct gradient.
  • Contact the permit office for the correct diameter sewer pipe required in your area.

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