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I have a main drain line running from my 1940s era single family residence in Las Vegas, NV to the city sewer. Given the time period I had assumed it would be cast iron, but when I dug down to it, it didn't quite look like cast iron I'd seen before. It has a distinct hammered, shiny finish and has zero corrosion, despite being buried in the ground for (I assume) nearly 80 years. Can anyone verify that cast iron looks like this sometimes? If not, what else could it be?

Thanks in advance!

enter image description here

JG307
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It will be hard to definitely identify the material. Given the time frame, my first guess would have to be Orangeburg pipe. The shiny surface could be from the coal tar used to cover the pipe. The only problem is that it looks in amazingly good shape, might be due to the dry Las Vegas climate. A picture of it is shown below. (from web, Paul Duffau)

enter image description here

JACK
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