I've got an architect who has specified a 4" waste line with a run of 160' from a guest house that serves a wc, shower, lavy and sink. I plan to suggest a 3" line because I'm worried about line carry of waste in a situation with a 1.3GPF wc, few other water sources scouring the line and intermittent overall water usage due to the sporadic occupation of the building. What do you think?
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3" or 4" lateralPage Title Module
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