What type of fitting is NOT allowed for connecting 2 urinals without a cleanout fitting?

The answer regarding which type of fitting is not allowed for connecting two urinals without a cleanout fitting pertains to the structural integrity and the efficiency of drainage systems as outlined in the National Plumbing Code of Canada. In this context, the double sanitary T fitting is problematic due to its potential for creating traps and restricting flow when not utilized properly.

In plumbing systems, the use of fittings is strictly regulated to ensure appropriate drainage and prevent issues such as clogs. A single sanitary T fitting, for instance, allows for the connection of a vertical branch to the main drain, which can effectively handle the waste from a single urinal, keeping the flow direction aligned. Similarly, a wye fitting facilitates smooth transitions between pipes, aiding in efficient waste removal without creating areas where blockages can easily occur.

Cross fittings, while less common, can also be used in specific scenarios where multiple connections are needed, although with care to ensure that they don’t impair drainage performance.

Understanding the limitations of various fittings is critical in plumbing design, particularly in preventing drainage issues and ensuring the system remains code-compliant. The prohibition of the double sanitary T fitting reflects a commitment to maintaining flow efficiency and minimizing the risk of clogs in systems designed for multiple connections without additional access points like clean