What is the minimum size trap required for a pedestal urinal?

The minimum size trap required for a pedestal urinal is 3 inches. This size is specified in plumbing codes to ensure that the urinal functions effectively by providing an adequate flow capacity for waste and preventing blockages. Pedestal urinals, which are common in commercial settings, often have higher usage than standard residential fixtures, and a larger trap helps accommodate the increased volume of liquid waste they manage. The 3-inch trap size balances the need for efficient drainage with the plumbing system's overall requirements for venting and preventing siphoning. Selecting a trap size smaller than this could lead to performance issues, such as slow drainage or frequent clogs, which could compromise sanitation and efficiency in public restroom facilities.