The Schluter KERDI Mixing Valve Seal 4-1/2" (D8) is a high-quality product manufactured by the reputable brand Schlüter. Designed specifically for use in flooring and tile installations, this seal ensures a secure and watertight connection between the mortar and subfloor, providing a reliable barrier against moisture and water damage. With its 4-1/2" size, this mixing valve seal is suitable for various tiling projects, offering durability and performance for a seamless finish. trusted and recommended by professionals in the industry, the Schluter KERDI Mixing Valve Seal is a must-have for any home improvement or construction project involving flooring and tiles.