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    Strange Drain

    All drain lines are pitched at 1/4"/ft. Hj, You're right about the trapped air not being able to escape the grid drain. I can see it (an air bubble) in there while the drain gurgles. If I take a...
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    1,743

    Strange Drain Problem

    I just installed a 15" round hand sink (w/o overflow) and a grid drain in a new commercial remodel. There appears to be a "back pressure" at the grid drain which makes for very sluggish drainage...
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