The combined system of drain pipes that carry wastewater away from fixtures and vent pipes that prevent sewer gas from entering the building.
The system of pipes in a building that removes wastewater and sewage from fixtures while venting sewer gases to the atmosphere. The drain portion carries liquid waste, the waste lines serve fixtures not carrying fecal matter, and vent pipes equalize pressure to allow proper drainage. DWV systems are typically made from PVC, ABS, or cast iron pipe.
The rough-in inspection covered all DWV piping before the concrete slab was poured.
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