The Keurig K2.0-400 Coffee Maker WATER HEATER BOILER TANK is a water heater specifically designed for use with Keurig pod coffee machines. It is made of plastic, comes in a multicolor design, and is compatible with the Keurig k2.0-400 model. It is a single pack item and is not a custom bundle. This water heater boiler tank is essential for ensuring your Keurig coffee maker dispenses hot water properly.