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Customizable Inflatable Rubber Culvert Balloon Plug for Construction Drainage. Customizable inflatable rubber culvert balloon plug, ideal for construction drainage and pipeline plugging. Durable rubber material with excellent air-tightness, creating a reliable seal for pipes and culverts. Easy to inflate and deflate, reusable and low-cost, suitable for various construction scenarios. Customizable size and pressure rating to meet your specific pipeline and project requirements.