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What is the right fall in the main plumbing line?

Updated: 8/16/2019
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15y ago

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Optimally, 1/4 inch per foot. for those of us who work in metric. waste pipes must have a gradient of 1:40. therefore for every 40 meters one should have a one meter drop.

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Q: What is the right fall in the main plumbing line?
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