Clay sewer pipe is a material that is far superior to it's reputation. It can last for over a hundred years and doesn't corrode or deteriorate.
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When did they stop using clay sewer pipes? - Quora
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Clay Pipe Has a New Standard
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Clay pipes hi-res stock photography and images - Alamy
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Vitrified Clay Sewer Pipe Has Been Around Four Thousand Years
Clay Pipe Has a New Standard
Old clay sewer pipes under basement
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Sewerage Clay Pipe Vitrified Clay Pipe Stock Photo 1989677351
Vitrified clay pipe hi-res stock photography and images - Alamy
Clay pipes, 4in diameter. - general for sale - by owner - craigslist