When an approved two-way cleanout fitting is installed inside a building, is it necessary to install an upper-end terminal cleanout?

Installing a two-way cleanout fitting provides the ability to easily clear blockages from two directions, which can be useful for maintenance and plumbing repairs. In many plumbing codes, when such a fitting is properly installed, the need for an additional upper-end terminal cleanout is typically eliminated.

The reason a terminal cleanout is not always necessary with a correctly positioned two-way cleanout is that the two-way design allows for adequate access to perform maintenance on the plumbing system without requiring an additional cleanout point. This efficiency streamlines plumbing layouts and reduces potential points of leakage or obstruction.

While codes and regulations can vary by locality, the general consensus is that if the two-way cleanout is approved and properly installed, an upper-end terminal cleanout is not mandatory. This holds true unless specific situations or local amendments to codes dictate otherwise. Thus, it is accurate to say that there is no requirement for an upper-end terminal cleanout in this context, confirming that the answer is indeed that it is not necessary.