PVC Water Stoppers are flexible strips which provide a physical barrier to water at concrete joints. They are mostly used in construction of basements, water retaining structures like water tanks, swimming pools, structural foundations and other below ground level constructions. Water stoppers are also termed as water bars, seals or construction joints. A typical PVC water stopper has two identical half on both sides of a central bulb. These additional extensions are provided with the aim of increasing path length for water entering behind the edge of water stopper.