What is the minimum size of the water supply inlet for a drinking fountain?

The minimum size of the water supply inlet for a drinking fountain is typically 1/2 inch. While a 3/8 inch inlet might seem adequate for smaller water applications, it does not meet the standard requirements for drinking fountains. A 1/2 inch diameter allows for sufficient water flow necessary to ensure the fountain operates effectively, providing an adequate supply of drinking water. Therefore, the accepted minimum for most plumbing codes and regulations calls for a 1/2 inch supply to support the volume and pressure needed for proper functioning. This ensures that users can access water quickly and conveniently without any issues related to pressure or flow.