As an auxiliary accessory, the overflow pipe is used to drain the remaining liquid into the waste pipe. It is connected to the waste pipe. After pouring the foaming agent and water into the kitchen sink, the water will be drained through the waste pipe due to its heavy weight. The air pressure generated during this process will be relieved through the overflow pipe. The foam is light and bursts slowly. Consequently, the foam that bursts more slowly will be pushed out of the overflow port by the air pressure. Currently, JOMOO kitchen sinks and most other kitchen sink brands on the market do not have structures to prevent foam or water backflow. This is not a quality issue. It is recommended to use a small amount of dishwashing liquid when washing dishes.