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The outside diameter remains the same to simplify joining.
Of course it could just have been thin wall tubing or conduit also, but it definitely wasn't "four inch thick" pipe...
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They sure are loud, certain of themselves and offensive though, aren't they. It's amazing, really.
"It was at this point real dread set in. It looked like the four of us were telling the truth. We were. And to the deluded who cherish the genetic fallacy this appeared that our result might be true, too. So the mentally feeble David Appell (sometime scourge of the comment box) put a FOIA request to the employer of Legates, but the poor soul was rebuffed because no state monies were involved in the writing of the paper. As we claimed. Then Greenpeace contacted the employer of Soon with the same intent, and Greenpeace discovered that Soon was in the same state as those who receive Greenpeace money. Which is to say, Soon in his career received money from sources other than our beneficent government. But he didn’t get anything for the paper the four of us wrote. How disappointed Greenpeace must have been to have discovered that."