What type of cleanout is not necessary if an approved two-way cleanout fitting is installed near the connection between the building drain and building sewer?

The type of cleanout that is not necessary when an approved two-way cleanout fitting is installed near the connection between the building drain and the building sewer is an upper-end terminal cleanout. This is because the primary purpose of the upper-end terminal cleanout is to provide access to clean out blockages that may occur in a vertical stack or the upper portion of the drainage system.

When a two-way cleanout fitting is installed at the junction of the building drain and sewer, it allows for the clearing of blockages in both directions—upstream towards fixtures and downstream towards the sewer. Since the two-way cleanout serves to facilitate access for cleaning and maintenance throughout the system, the need for an upper-end terminal cleanout is eliminated.

In contrast, other types of cleanouts, such as end-of-line, access, and inline cleanouts, serve different purposes and are typically required to ensure that the drainage system can be efficiently maintained and cleared at various points along the piping system.