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Old sewer lateral pipes, August 2009
Old cast-iron drain pipe removed from house.
Inside of old drain pipe.
Inside of pipe nearly occluded from rust.
Somehow the plumbers managed to get all the pipe out through the crawlspace opening.
If your cast-iron pipes starting weeping like this on the outside, they're probably ready to be replaced.
In the old days sections of cast-iron pipe were brazed together with lead.
Click on a picture to enlarge it.