Journeyman Plumber ExamDrainage, Waste, and Venting (DWV) SystemsMedium
A plumber is inspecting a newly installed 4-inch building sewer. What is the maximum distance a cleanout can be from the junction of the building drain and the building sewer?
- A5 feet
- B50 feet
- C20 feet
- D10 feet
Show answer & explanationAnswer & explanation
Correct answer: D. 10 feet
Plumbing codes generally require a cleanout to be installed within a specific distance (usually 10 feet) of the junction between the building drain and the building sewer to allow for clearing blockages at this critical transition point.
Why the other options are wrong
- A. 5 feet is often the maximum distance for a cleanout from a change in direction or within a trap arm, not the building sewer junction.
- B. 50 feet is the maximum spacing for cleanouts on long, straight runs of horizontal drainage piping, not at a critical junction.
- C. 20 feet is too far for this specific critical junction point, making it difficult to clear blockages effectively.
Building Drain/Sewer Junction Cleanout
A required access point for cleaning installed near the connection of the building's internal drainage system to the main sewer line.
- Crucial for clearing blockages where drain meets sewer.
- Specific distance requirement for placement.
- Ensures accessibility for maintenance.
Memory trick: Cleanouts Close to Connections, Clear the Clogs.