Schluter Systems Kerdi-Shower-T/-TS/-TT 48-in W x 48-in L Orange Square Shower Pan Base (Center Drain)Kerdi Shower T TS TT is a prefabricated sloped shower tray with integrated Kerdi waterproofing. It is lightweight and made of expanded polystyrene. The shower tray eliminates the need for a mortar bed making installation quick and easy. The Kerdi Shower T TS TT is designed to integrate with the Schluter Kerdi Drain. Sloped shower tray features integrated Kerdi waterproofing Specifically designed for use with Kerdi Drain Tray dimensions are 48 in x 48