The maximum trap loading for a 3 inch trap is _____ unit(s).

The maximum trap loading for a 3-inch trap is set at 6 fixture units according to the Uniform Plumbing Code. This specifies the maximum amount of wastewater load that the trap can handle effectively without leading to issues such as overloading or potential backup.

The trap serves the essential function of maintaining a water seal to prevent sewer gases from entering the building, while also allowing for efficient drainage. The designation of 6 fixture units for a 3-inch trap is based on calculations that take into account the size and capacity of the trap in relation to typical wastewater flow rates. This ensures that the plumbing system operates optimally and reduces the chances of malfunctions or maintenance issues over time, thus maintaining the integrity of the overall plumbing infrastructure.