_____________ is the minimum depth of a trap seal in inches?

The minimum depth of a trap seal is 2 inches. This measurement is essential in plumbing systems to ensure that there is an adequate water seal within the trap. A trap seal serves to prevent sewer gases from entering the building, providing a critical barrier for health and safety. A depth of 2 inches is considered the optimum level that will maintain this barrier effectively while minimizing the risk of the trap losing its water seal due to evaporation or siphoning.

Higher depths may not provide additional benefits in terms of blocking sewer gases and can create unnecessary space within plumbing systems that could complicate maintenance and installation. Thus, adhering to the 2-inch trap seal depth is both a standard requirement and a practical solution to ensure a safe and functional plumbing system in compliance with the plumbing code.