Its function is that when the water in the basin rises to the overflow, water will flow from the overflow hole into the sewage pipe. The overflow function means that when the water in the basin exceeds a certain water level, it will automatically drain the water from the basin and will not accumulate in the basin. This is more hygienic and clean.
With the role of overflow is when the water in the basin rises to the overflow, it will flow from the hole to the sewage pipe, and will not flow to the ground. Household sanitary ware basins are best equipped with overflow function to prevent forgetting to turn off the water and cause damage to the ground.
