How to connect PVC plumbing to cast iron

Written by tara dooley
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How to connect PVC plumbing to cast iron
PVC pipes are replacing older pipes such as cast iron. (Jupiterimages/Comstock/Getty Images)

Older home plumbing ranges in material make-up from copper and lead to cast iron. These pipes are being replaced in new construction with PVC pipes, which last a long time with very few complications. If you must replace an old section of cast-iron pipe, PVC is easily installed and connected to the iron with a coupling fitting and PVC glue.

Skill level:
Moderately Easy

Things you need

  • Diamond-tip blade
  • Fine-tooth blade
  • PVC pipe
  • PVC cleaner
  • PVC adhesive
  • Brush
  • Rubber coupling

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  1. 1

    Turn off the water to the house. Turn the valve clockwise to shut it off.

  2. 2

    Cut out the damaged piece of cast-iron pipe with a diamond-tip blade and remove it.

  3. 3

    Place the cut pipe next to PVC pipe of the same diameter. Mark the length of the iron pipe onto the PVC pipe. Cut the PVC pipe with a fine-tooth saw, so the segment's length matches that of the damage iron piece.

  4. 4

    Clean the ends of the PVC pipe with PVC cleaner. Rub it on and let it dry.

  5. 5

    Insert the couplings onto the cast-iron pipe openings.

  6. 6

    Brush PVC adhesive onto the ends of the PVC pipe and slide the pipe onto the couplings to close the gap in the plumbing.

  7. 7

    Tighten down the bands of the couplings to seal them to the PVC and the cast-iron pipe ends. Turn the water back on and test the pipe for leaks. If you see a drip, tighten the couplings down a little more.

Tips and warnings

  • Wear safety glasses when cutting the pipes to avoid getting shards in your eyes.

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