The One Piece Closet is not only aesthetically pleasing, but also offers the benefit of being easier to clean versus a two-piece toilet. By removing the gap between the tank and bowl, we eliminate the hiding place for dirt and debris. In a one piece toilet, the tank and the bowl are a single unit. There is no visible separation between them. One piece toilet has a more attractive design than a two piece toilet. This is because they have fewer corners and hidden contours. You can recognize a one-piece Closet by the fact that there is no seam visible between the toilet tank and the bowl.