Bathroom fixtures help set the tone of a room. For instance, concealed shower valves create a more modern look over the traditional turned knob assembly for controlling a shower's output and water temperature. These valves usually involve one handle twisting in a clockwise fashion to turn on the water flow. The further you twist the handle, the warmer the water becomes. This device allows for more control over the water's temperature but less control over the hardness of the spray coming out of the showerhead. Available in a brushed metal look, the concealed shower valves are often part of a larger kit that includes the showerhead and sometimes a slider rail. However, all concealed shower valves come with a matching backplate that seals off the access hole in the wall. Despite the relatively simple sounding design, shoppers find a great variety of designs to choose from on eBay. Therefore, consider replacing your old shower valve system with a new concealed valve to have more temperature control at your fingertips.