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Comb Tooth Expansion Joint Finger Bridge Joint for Overpass Viaduct Highway Bridge. Reliable Waterproofing: Integral sealing structure prevents leakage under 0.2MPa water pressure for 24 hours. Fast Installation: Simple on-site installation allows traffic opening within 2-4 hours. Long Design Life: Anti-aging formula provides a 15-20 year design life for durability. Customizable Standard: Standard dimensions and specifications can be customized according to customer needs.