Schluter KERDI Prefabricated Sloped Shower Tray, 48 x 72" is a lightweight, mortar- shower base designed to integrate seamlessly with Schluter's KERDI-DRAIN and KERDI-BOARD-SC shower curbs. Featuring integrated KERDI waterproofing, this tray eliminates the need for a traditional mortar bed, ensuring quick installation and superior mold and mildew resistance. Made of expanded polystyrene and pre-sloped to direct water flow efficiently, it is i for curbless showers. Ready for tile installation, this shower tray provides a durable and waterproof solution for your shower needs. Model Number: KST 1220/1830