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Hydrophilic Swellable Rubber Water Bar for Concrete Joints in Tunnels Culverts. High-Swell Bentonite Core: Expands up to 800% on water contact for permanent sealing. Self-Healing: Re-expands on re-wetting, sealing micro-cracks automatically. Tool-Free Installation: Nail or glue to concrete -- no welding or curing needed. Broad Application: Tunnels, basements, pipe penetrations, all concrete joints.