The Schluter KST1220/1525 is a prefabricated sloped shower tray designed for ease and reliability. It is waterproof, ready to tile and features integrated KERDI waterproofing. It is quick and easy to install eliminating the need for a mortar bed. Made of lightweight, expanded polystyrene. Available in thin perimeter heights to simplify construction of curbless showers. Available in twelve sizes available, including a neo angle configuration and off-center drain for tub replacements. Specifically designed to integrate with KERDI- BOARD-SC shower curbs, KERDI, and KERDI-DRAIN. Founded over 40 years ago by a master tile setter, Schluter Systems pioneered innovative tile and bathroom waterproofing solutions, consistently setting industry benchmarks for craftsmanship and durability.