8 In-Wash with In-Tank® Space-saving These models are the ideal solution to optimize space in the bathroom, as the tank, either installed on the bowl or as a built-in option, is removed. Easy installation As they do not require a cistern, it is not necessary to do any work like in the case of built-in systems, which makes the installation process significantly easier. Integrated tank These new models do not require the installation of a cistern, neither conventional nor built-in, as the water tank is integrated in the bowl.