A residential plumbing system that connects various fixtures, including sinks, toilets, and showers, into a common drainage and venting system. At the top, the roof vent allows air to enter the plumbing system, maintaining proper pressure for smooth water flow and preventing siphoning of water from P-traps. The flashing seals the vent where it exits through the roof to prevent leaks. Inside the house, individual fixtures, such as the sink, toilet, and shower, each have a P-trap designed to retain water and block sewer gases from entering the living space.
The waste line and soil pipe transport wastewater from the fixtures down into the larger vertical soil stack. This stack acts as the main channel for waste removal, directing sewage to the sewer or septic tank. A horizontal revent line connects the plumbing fixtures back to the roof vent, ensuring proper air circulation and pressure equalization throughout the system. Near the base of the system, the clean-out plug provides access for clearing clogs or conducting maintenance in the soil stack. The P-traps below each fixture prevent foul odors while ensuring smooth drainage into the stack. This interconnected system efficiently handles wastewater removal while maintaining proper ventilation, ensuring safe and hygienic plumbing throughout the home.