Tile Redi Flash Waterproof Flashing Kit. Fits all 42 In. Depth x 48 In. Width Shower Base Models Waterproofing of the junction between the tile ready shower pan and the shower board Flashing System Kit includes 3 pieces to cover all three sidesplash walls of the shower pan Designed to address the waterproofing of the juncture between the tile ready shower pan and the shower board Aluminum material, never rust Quick and Easy to install, Used on any side of the shower pan where there is not a curb or a barrier free entrance