What is the required trap size for a kitchen sink?

The required trap size for a kitchen sink is 2 inches. This size ensures adequate drainage and helps prevent clogs, as a larger diameter allows for the proper flow of wastewater and solids commonly associated with kitchen use. The 2-inch trap size also aligns with plumbing code requirements aimed at minimizing the likelihood of siphoning and maintaining proper venting, which are critical for efficient drain operation.

In residential plumbing systems, especially in kitchens where food waste and greases are often present, a trap smaller than 2 inches may not effectively handle the volume and type of waste. Additionally, using a trap that complies with the code helps protect the health of the system by preventing issues like backflow and unpleasant odors, ensuring that plumbing maintains its proper functional integrity.