Schluter® KERDI-DRAIN GRATE KIT TILE 4"This is how you make a shower drain disappear. You tile right over it. When you're done grouting, there's no stainless disc, no grate, no obvious circle in the floor just continuous tile, with water draining somewhere you can't see. Product Overview The Schluter KERDI DRAIN Tile Grate Kit 4" is a drain cover designed to be tiled over completely. The kit consists of a stainless steel plate with KERDI waterproofing material laminated onto the top