The WC is not actually the room where the toilet is situated, it is actually made up of the pan and the cistern, the cistern holds the water for flushing and the pan holds waste (if only for a short time). These two items are joined by pipework. There are two options for the cistern and that is either a low or high level. They are manufactured from something called Vitreous China, this is better known as ceramic. The cistern is secured to the wall by screws. To release the flushing water a button is pressed or a lever operated. The button is on the top in the centre and the lever is on the top right or left side of the cistern. The cistern is 600mm above the floor. It holds 9ltrs as standard, but can provide both 9 and 4.5 lts, depending on the flush required. Low level cisterns are 200mm from front to back but will not sit behind the pan so a slimline is used.A slimline cistern is as little as 115mm from front to back. A Mill Hill Plumber is qualified to advise on and fit these units.Low Level Cistern:A WC suite that can be connected to the pan by a short pipe or can be what is termed ‘close coupled’ meaning both the pan/cistern are joined together as one unit.Dual Flush:The dual flush type provides either a water saving small flush or a double sized flush for solid waste removal. The differences can be explained by Mill Hill Plumbers.WC Pans:There are two types of pan constructed of ceramic (screwed to the floor via holes in the base), they are a wash down pan and double trap siphonic, the wash down is common splashing water down the pan sides to expel the waste, the double trap uses suction but is hardly used. Some sit flush to the wall or can be wall hung. The outlet pipe needs to be connected to a soil pipe, horizontal to the pan. “