IMPORTANT: Measure your sink drain opening diameter to ensure it matches the required 1.75-in. for this pop-drain to fit correctly for proper fit. OVERFLOW: Designed exclusively for use with bathroom sinks that include an integrated overflow drain system to control water level and prevent spills. COMPATIBILITY NOTE: This product cannot be used with any vessel sinks or sinks without overflow. SEAMLESS DRAINING: Engineered to support quick and complete water drainage SIMPLE PRESS-SEAL: One-touch operation secures or releases the drain plug instantly for effortless water control. WARRANTY: 5-Year Satisfaction Guarantee. California Residents: See Prop 65 WARNINGS for more information. Never underestimate the impact of a great accessory. The VIGO Vessel Bathroom Sink Pop-Up Drain with Overflow instantly updates any bathroom sink setup. Built from solid brass for exceptional durability. This model comes with an overflow hole and threaded nut to allow for diverted overflow water to drain down the pipe.