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 self cleaning vortex waste - Low profile design - Tested flow rate of over 30 litres per minute - Install flat to the floor or raised on legs - Made from 100% Natural Stone Resin - Supplied with a lifetime guarantee from the manufacturer Important Information - Shower tray riser kit sold separately (Available in our eBay Shop) Technical Specs Shower Tray Type Flat Top Shower Tray Width 1000mm Shower Tray Depth 800mm Shower .