
What Is the Point of an Overflow Drain?
The point of an overflow drain is clear whenever you accidentally leave the bathtub faucet running. These openings in your tub or sink are safeguards against flooding, serving a simple but essential purpose of keeping water from damaging your flooring, cabinets, and other parts of your home. Why Overflow Drains Matter Overflow drains are additional openings near the rim of a sink or bathtub that redirect excess water before it spills over the edge of a sink or tub. The purpose of overflow drains is to act as a backup to the main drain, overflow drains protect your home from water damage — without it, water can spill over the rim and damage flooring, cabinets, and walls. What Is an Overflow Drain? An overflow drain is a built-in secondary drain that diverts water away safely if the sink basin or tub fills beyond a certain point, such as when the main drain is closed or blocked. The overflow drain works by routing water through a passage from the upper wall of the sink or tub to the fixture’s main drain line or P-trap. Where you’ll commonly find overflow drains Overflow drains are commonly located just below the upper rim of









