The Keurig K Duo 5100 Coffee Maker Replacement Part Water Heater Assembly is a black water heater specifically designed for the Keurig K Duo 5100 model. This assembly comes in a pack of 1 and is suitable for use with Keurig coffee makers. With this replacement part, coffee enthusiasts can easily maintain and repair their Keurig K Duo 5100 coffee maker, ensuring a steady supply of hot water for brewing delicious beverages.