DANCO Reduced-Lead, Ceramic Stem for Kohler, Brass, 4Z-10H, 1-Pack (17476E) Constructed of a strong and durable brass, meaning it was built for longevity. A perfect fit for Kohler faucets, with an ID length of 4 and Z broach. This was designed for cold water application. This is ceramic disc style. This is in compliance with the Reduction of Lead In Drinking Water Act.