What is the minimum fixture pipe size for a single outlet urinal?

The minimum fixture pipe size for a single outlet urinal is typically 1 inch. This size is recommended to ensure proper flow and drainage to prevent clogging and to accommodate the volume of water used in flushing the urinal. Using a larger size than minimum, such as 1 1/4 inches, could allow for better drainage and lower the risk of blockage but is not required for a single urinal.

Sizing smaller than 1 inch, like 1/2 inch or 3/4 inch, may not provide adequate water flow, particularly when multiple fixtures are being used simultaneously in a plumbing system. Therefore, the best option for ensuring efficiency and maintaining plumbing standards is 1 inch.