What is the trap size for a urinal that is classified as a trough?

In plumbing, the trap size for a urinal classified as a trough is typically 1 1/2 inches. This size is specifically chosen based on the design and flow requirements of trough-style urinals. Trough urinals are designed to accommodate the drainage from multiple users and require a trap that can handle a sufficient flow capacity while preventing sewer gases from escaping into the restroom.

The 1 1/2-inch trap size is standard across many plumbing codes and regulations for trough urinals, ensuring efficient drainage while maintaining the necessary venting and trap seal. This allows for proper functioning without risking clogs or slow drainage, which could occur with traps of inadequate size.