The Danco cone washer is designed to be used for toilet or sink supply repair. Cone washers are used to create a leak-proof seal at the water supply inlet. They are used on both faucets and toilet ball-cocks. Replacing a worn washer is an easy DIY project. New washers eliminate leaks which waste both water and energy and can damage floors. Unit: CD3 UPC: 037155803309 Model Number: 80330