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Dual-Cavity Composite EPDM Seal Strip & Rubber Tube. Superior sealing: Dual air chambers ensure reliable waterproofing, dustproofing, and sound insulation. Durability: Excellent UV/ozone/aging resistance, with a service life exceeding 10 years. High resilience: Maintains tight sealing performance under repeated compression. Weather resistance: Stable performance in extreme cold, heat, and humid environments.