What is necessary for a back outlet water closet installation using double sanitary T fittings?

In the context of installing a back outlet water closet with double sanitary T fittings, the inclusion of a cleanout fitting above the connection is essential. This requirement is due to the need for maintaining the plumbing system and ensuring proper accessibility for maintenance and cleaning tasks. A cleanout fitting allows for easy access to the plumbing system to clear blockages or perform inspections, which can be critical, especially in setups that may be susceptible to clogs.

The presence of a cleanout fitting ensures that any issues within the drainage line can be addressed without needing to dismantle sections of the piping. This focus on accessibility upholds good plumbing practices, as per the National Plumbing Code of Canada, which advocates for designs that facilitate maintenance and future repairs.

Other considerations like access for inspection, separation from other fixtures, and specific pipe lengths may have their importance, but they do not specifically address the immediate functional requirement that a cleanout fitting fulfills in maintaining the integrity and operability of the back outlet installation.