This Danco Single-Hole Bathtub Drain Overflow Plate in Chrome is designed to prevent water in the bathtub from overflowing. When water overflows from the tub, it can cause significant damage to the floor, other appliances, and the bathtub. This 1-hole face plate comes with an adapter where it can replace 1-hole or 2-hole overflow plates. A screw is also included for easier installation of the drain overflow plate.