This bathroom sink drain incorporates patent-pending technology that improves drainage performance by up to 40%. This unique concave design promotes water flow toward the center of the drain, enhancing drainage and preventing ponding. With the plumbing professional in mind, we’ve made this bathroom sink easy to install, including a putty-less washer, TPR basin washer, and heavy-duty locknut with large wrench flats. It is available for sinks with and without overflow and features a 1-1/4-in standard outlet pipe that fits sink drain holes at least 1-1/2-in diameter. The elevated finish and solid brass construction provide long-lasting durability. You can install with confidence knowing Keeney stands by this product with a limited warranty.