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Old 03-15-13, 09:28 AM   #10
gt390
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Join Date: Dec 2012
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Just a thought, I understand the intent of the sand is to avoid flattening the copper but would it be so bad if it did flatten out against the OD of the large pipe? You might slightly affect pressure drop in the line, but you would get a larger contact surface on the drain pipe. The link attached above looks almost like square tubes wrapped around the large drain pipe.
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