cast iron pipes
If you are planning to replace the section with the hole in it you will need:
A tape measure
Light metal strapping and concrete or wood screws (depending on the wall next to the pipe)
A hacksaw or reciprocating saw
2 rubber pipe collars and 4 band fasteners (I can't remember the name of the rubber collars/fasteners. If you ask an plumbing section employee at your home center they should be able to point you to it.
PVC pipe cut to the length of the section you will cut out.
Use the light metal strapping and screws to anchor the pipe above and below the section to be replaced. Fasten one end of the strapping on one side of the pipe, wrap the strapping tightly around the pipe and then fasten the other end of the strapping to the wall on the other side of the pipe. If you don't anchor the plumbing above, when you cut the pipe out, the rest of pipe above (connections to the kitchen and bath) may be damaged as the above pipe falls from the weight. Anchoring below the cut section before you cut will make it easier to cut the section out as it has less chance to vibrate as you cut it.
Use a hacksaw or reciprocating saw to cut a section of metal pipe that has the hole in it. Remember to cut the section long enough to allow the rubber collars enough overlap at each end.
When the section is out, slide the rubber collars with the band fasteners loosened onto the ends of the remaining upper and lower pipe.
Insert the section of PVC pipe, slide the rubber collars so that the ends of the replaced section are properly overlapped by the rubber collars, then tighten the band fasteners so that the rubber collars are sealed at both ends.
That should do it.
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