The Keurig K-Duo Essentials 5000 Replacement Part Water Reservoir Tank Lid is a clear plastic lid designed specifically for the Duo Essential 5000 model. This product is compatible with Keurig brand coffee makers and comes as a single pack. It is essential for maintaining the functionality of your coffee maker, ensuring a secure seal to keep your water fresh and ready for brewing delicious beverages. This replacement part is a convenient and necessary addition for your Keurig K-Duo Essentials 5000 coffee maker.