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Hydrophilic Waterstop Strip Water Stopper Swelling Strips for Tunnel. High Expansion Rate: Expands 200%-500% upon water contact for automatic sealing. Customizable Color: Available in black, red, and other customized colors. Self-Healing Capability: Automatically repairs gaps caused by structural deformation. Durable Material: Made of premium natural or synthetic rubber with anti-aging agents. Corrosion Resistance: Resists aging and corrosion for long-term performance. Customizable Size: Various widths and heights available; other specs can be customized.