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The seller bragged,


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What do the letters SDR stand for?


In the trades around here, it just means "sewer pipe," though most people here call it "3034," after its ASTM designation.

In a quick Google search, I was surprised to find that it actually means "Standard Dimensional Ratio" and refers to the ratio between the diameter of a pipe and its wall thickness - the lower the SDR number, the thicker the pipe wall.

The thing in the picture does, indeed, look like sewer pipe.

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