The S&B Fresh Water Tank comes with all the components to remove your 21 gallon tank and replace it with our 42 gallon tank. The tank mounts in the same location as the original tank and utilizes the unused space in the compartment. The replacement water tank continues to utilize Storyteller plumbing and water level readings. It also includes pre-installed water level sensors that connect to the Storyteller water level module. The S&B Tank stays inside the vehicle and out of the elements to help prevent freezing.