FLAT-TOP AND UPSTAND TRAY DIFFERENCES Unlike on the continent, many British bathrooms are not completely 'wet' areas. A shower tray with an integral tiling upstand provides a raised lip to be tiled against. A flat top tray does not include this raised lip, but are far more common. Features and Benefits - Includes High flow vortex waste with stainless steel cover - Tested flow rate of over 33 litres per minute - Advanced design features incorporating hidden water capture and virtual flat surface technology - Made from 100% Natural Stone Resin - Genuine wet room alternative without the associated costs and fitting challenges - Fully complies with EN274 European standard for shower flow rates - Flush fitting with floor tile for level threshold entry - Unique 135 x 135mm.