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What is this pipe and is this corrosion concerning?Selling the home and buyer is doing home inspection. : r/Home
Should a cast iron drain pipe for the toilet in an older home be replaced if a noticeable bulge has appeared on it? - Quora
Appearance of corrosion scales on cast iron pipes in an actual DWDS (a)... | Download Scientific Diagram
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plumbing - Are bumps on the inside of a cast iron drain pipe a sign of a problem? - Home Improvement Stack Exchange
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