PASCO Vinyl Shower Corners are a pre-made vinyl corner that is easy to install and makes an ideal waterproof joint. PASCO Pre-Fab Corners come in 4 pre-shaped corners: #3000 Flush Dam Corner: Flush Dam Corner Use where a flat wall or tall backing board meets a dam at a 90° angle. #3002 Return Dam Corner: Use where wrap-around protection is necessary. #3003 Top Dam Corner: Use where a wide 90° top corner of a two dam stall or roman tub meet. #3005 Inside Corner: For deep tubs. Prevents folded pan buildup in corners.