What is the minimum diameter of a water supply line typically required for a residential fixture?

The minimum diameter of a water supply line typically required for a residential fixture is indeed 1/2 inch. This size is commonly used in residential plumbing systems for various fixtures such as sinks, toilets, and showers. Using a 1/2 inch line provides adequate flow rates for typical household demands while maintaining appropriate water pressure.

A larger diameter, like 3/4 inch or 1 inch, may be necessary for specific applications, such as supplying multiple fixtures simultaneously or in larger homes where greater water supply capacity is needed. However, for individual fixtures, a 1/2 inch line is generally sufficient to meet the plumbing code requirements and ensure proper functioning without excessive pressure loss.

The size of the water supply line should always align with the fixture's demand, plumbing code requirements, and overall system design. Therefore, 1/2 inch is recognized as the standard minimum for a single residential fixture connection.