A drain pipe that carries dirty water from sinks and floor drains — but not toilet waste — to the main building drain.
A drain pipe that carries liquid waste (without solid fecal matter) from sinks, floor drains, laundry equipment, and other non-toilet fixtures to the building drain. Waste pipes differ from soil pipes in that they do not convey toilet waste. They must be vented and sloped at the proper grade (typically 1/4 inch per foot) for self-cleaning flow.
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