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Cascade Plumbing - When your drain pipes flow AWAY, it is important to have proper gradual downward slope to allow your vents to do their job. | Facebook
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plumbing - Do I need a slope in drain lines under sink? - Home Improvement Stack Exchange
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How can a drain pipe be sloped (say 1/4' per foot) if it is attached to a perfectly vertically plumb pipe by a 90 degree fitting? By geometry, this doesn't work. Where
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