Where a Drain Blockage May Be Located
Plumbing systems consist of several connected sections that take wastewater from individual rooms to the municipal sewer:
- Drain Opening: The visible grate or stopper inside a sink, shower, or bathtub where water enters.
- P-Trap: The curved pipe section beneath a fixture that holds a water seal to help prevent sewer gases from entering the building. Hair, grease or debris may also collect inside the bend.
- Fixture Drain: The short individual drain pipe running from a single fixture into the wall or floor.
- Kitchen or Bathroom Branch Line: A medium-sized pipe collecting wastewater from multiple fixtures within a single room or area.
- Shared Drainage Line: A larger internal stack connecting branch lines from different bathrooms or floors.
- Property’s Main Sewer Lateral: The main underground pipe carrying all building wastewater from the foundation out to the street.
- Exterior Cleanout Access: Ground-level pipe caps outside the building providing direct opening into the main sewer line.








