An overview of the residential plumbing system describes the essential components of water supply, drainage, and ventilation. Drains serve as a central vertical pipe that connects various utilities, allowing wastewater to flow downward while ensuring proper ventilation. DWV (Drain-Waste-Vent) pipes are responsible for carrying wastewater from sewers, toilets, and other fixtures to a septic tank or system. P-traps, located below sewers and sanitary sewers, hold a small amount of water to prevent sewer gas from entering the home while allowing water to pass through. Supply lines distribute clean water to various fixtures, ensuring a continuous flow for household use. Vents extend through the roof, maintaining air pressure in the drainage system and preventing water from backing up into the traps. Clearances provide access points for clearing blockages and performing maintenance on the drainage system. Together, these features ensure the functionality, efficiency, and cleanliness of...