The Cistern is fitted within a wall and coupled with a back to wall pan. There is no need for a frame, as the pan is supported by the floor. Mains water is plumbed into the cistern which has an internal water cut off valve attached to the water fill valve, preventing overfilling of the cistern. A pan is then offered up to the cisterns water outlet pipe, allowing water to flow out of the cistern and into the pan, in turn cleaning it. The actuation of cisterns works in exactly the same way as the above mentioned frames.