Massachusetts Plumbers Journeyman Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The requirement for manholes in relation to underground piping is indeed specified by the diameter of the pipes. For larger diameter piping, manholes provide essential access points for maintenance and inspection, which become critical as the diameter increases.

In this case, a requirement for manholes starting at a diameter of 10 inches aligns with plumbing codes and standards, which often dictate that larger pipes necessitate easier access for functioning properly. Manholes allow for effective management of flow, sediment removal, and potential blockages that are more likely to occur in larger systems.

Therefore, the selection of 10 inches as the threshold for requiring manholes reflects a balance between accessibility for maintenance and the practicality of installations.