KOHLER K-303-K-NA 1/2-Inch Ceramic Wall-Mount Three-Handle Valve System One-piece ceramic valve resists debris and hard water buildup, Wall mount Ergonomic handle rotation provides on/off water control with only a quarter turn For 8 (203 mm) centers,  quarter-turn washer less ceramic disc valves, Integral diverter mechanism, Brass valve bodies, Solid brass construction ensures years of reliable performance