What is the minimum waste opening on a laundry sink?

The correct minimum waste opening for a laundry sink is 2 inches. This size is stipulated in plumbing codes to ensure adequate drainage and to accommodate the water flow and waste that a laundry sink typically handles. Laundry sinks often deal with a significant amount of water, especially when washing large items or heavy fabric, so a 2-inch opening helps prevent clogs and allows for more efficient drainage compared to smaller sizes.

While a half-inch opening may seem sufficient for smaller drainage needs, it would not effectively handle the volume and potential debris from laundry use. Therefore, the minimum specified diameter of 2 inches ensures both functionality and compliance with plumbing standards, ultimately promoting a reliable plumbing system in residential and commercial settings.