Waterstopper is a product made from virgin PVC designed for use in concrete construction joints, one side of which is subject to hydrostatic pressure. The Waterstopper is used as a barrier within the joint to prevent the passage of liquid through or across the joint. It is designed to accommodate lateral and transverse movements that cause the joints to open or close or misalign. Uses Waterstopper is designed to stop the ow of liquids through or across the joints in concrete construction, if properly installed. Some of the structures requiring Waterstopper include swimming pools, storage tanks, roof and or slabs, parking decks, bridge decks and abutments, foundations, basements, retaining walls, dams, locks, sewage and water treatment plants, water reservoirs, canals, tunnels, elevator pits, and all concrete structures requiring tight joints. Composition and Material Waterstopper is extruded from an electrometric plastic compound consisting of virgin polyvinyl chloride and additional resins, plasticizers, and stabilizers to meet or exceed the requirements and performance criteria of Corps of Engineers Specification CRD-C 570-73 It is chemically inert, contains no material reachable by water, and is highly resistant to acids and alkalis, ozone and oxygen, and to water-borne chemicals. Specifications British Standard Specification American Standard Testing Method (ASTM)