What is the minimum size waistline for a floor sink?

The minimum size waistline for a floor sink is typically established to ensure proper drainage and to comply with plumbing codes. A 2-inch waistline is the standard minimum as it provides an adequate flow of water while allowing for proper ventilation and minimizing the risk of clogs. This size is sufficient for typical applications where a floor sink is installed, such as in commercial kitchens or laundry facilities, where consistent drainage is crucial.

To maintain effective drainage and prevent backflow, it's important that the waistline size allows for the expected volume of wastewater. Larger sizes may be used in specific situations where higher volumes of water are anticipated, but the fundamental code requirement starts at 2 inches for general use.