What is used to join large trunk sewers when the junction cannot be made by a manhole?

What is used to join large trunk sewers when the junction cannot be made by a manhole?

• A. Cleanouts
• B. Air Test
• C. Junction boxes
• D. Backflow Preventers

Answer: (C)

When two large sewer mains can’t be connected with a manhole, a junction box is used. This structure creates a shallow, accessible chamber where the two pipes can join, allowing changes in direction or grade and ensuring the invert levels line up correctly. It provides maintenance access without the depth and size of a full manhole, making the connection practical in settings with difficult geometry or limited space. Other items like cleanouts, air tests, and backflow preventers don’t serve the purpose of joining large trunk lines, so the junction box is the appropriate choice.

When two large sewer mains can’t be connected with a manhole, a junction box is used. This structure creates a shallow, accessible chamber where the two pipes can join, allowing changes in direction or grade and ensuring the invert levels line up correctly. It provides maintenance access without the depth and size of a full manhole, making the connection practical in settings with difficult geometry or limited space. Other items like cleanouts, air tests, and backflow preventers don’t serve the purpose of joining large trunk lines, so the junction box is the appropriate choice.