What is the trap size for a urinal used in a stall?

The standard trap size for a urinal used in a stall is 2 inches. This size is designated to ensure proper drainage and waste flow for the volume of water and waste typically expelled from a urinal. In plumbing, sizing is crucial to prevent clogs and allow for adequate flow without creating unnecessary pressure in the system.

Choosing a trap size that is too small may lead to inadequate drainage, resulting in slow drainage and potential backups. Conversely, a trap size that is excessively large can create unnecessary space within the system and may not operate efficiently with the lesser volume produced by a urinal. Therefore, a 2-inch trap is the acceptable standard that balances performance and efficiency in a commercial setting where urinals might be used frequently, ensuring they work effectively in handling the waste they need to manage.