How to Patch Galvanized Pipe Without Threads

Written by c.l. rease
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Replacing a section of galvanised pipe generally requires that you thread the ends of the pipe to connect the pipe together. On galvanised drain lines that have no pressure, you can patch the pipe with a no-hub coupling. No-hub couplings are used seal connections on cast iron pipe, but they also work on other types of pipe as long as the two pieces of pipe have the same outer diameter. Installing a no-hub coupling onto galvanised pipe will save you money, because there is no equipment to rent.

Skill level:

Things you need

  • Pipe wrap
  • Permanent marker
  • Leather work gloves
  • Safety glasses
  • Empty 5-gallon bucket
  • Reciprocating saw
  • File
  • Tape measure
  • Section of galvanised pipe to span the repair area
  • Two no-hub couplings
  • Drill
  • 5/16th hex head tip for the drill

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  1. 1

    Lay the pipe wrap onto the galvanise pipe. Circle around the pipe twice with the pipe wrap. Align the pipe wrap on one side of the pipe that needs patching. Run the permanent marker around the edge of the pipe wrap. Move the pipe wrap to the other side of the damaged area of pipe. Re-align the pipe wrap, and mark the line with the permanent marker. Remove the pipe wrap from the galvanised pipe.

  2. 2

    Put on your safety glasses and leather work gloves. Place the five-gallon bucket beneath the cutting location of the galvanised pipe.

  3. 3

    Place the guard of the reciprocating saw against the pipe, with the saw blade aligned with the mark that you placed on the galvanised pipe in step one.

  4. 4

    Cut the galvanised pipe. Move the five-gallon bucket below the other cut you marked in Step 1. Perform the same procedure you used in step three to complete the second cut. Dispose of the damaged galvanised pipe.

  5. 5

    Measure the distance between the two cuts that you made in the last step. Mark the length of replacement pipe to fit tightly into the cut area. Cut the pipe to length with the reciprocating saw.

  6. 6

    Remove the burr from both cuts that you performed in step three with the file. Make sure that the both the interior and the exterior edges of the pipe are clean.

  7. 7

    Slide one no-hub coupling onto the piece of replacement pipe that you cut in step five. Make sure that the pipe seats into the coupling. Tighten the first band to secure the coupling to the pipe, using the drill and the 5/16th inch hex head tip.

  8. 8

    Slide the other no-hub coupling onto the existing galvanised pipe you cut earlier. Secure the coupling to the pipe using the same procedure described in step seven. Place the end of the replacement pipe with no coupling into the coupling secured to the existing pipe. Slide the replacement pipe's coupling over the other cut side of the existing pipe.

  9. 9

    Tighten the remaining bands located on the two no-hub couplings to seal both connections. Pour water down the drain to test the patch for leaks.

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