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Natural Rubber Airbag 600 900 1200mm Inflatable Culvert Balloon for Bridge Culvert Construction. Made of thickened natural rubber, high air tightness, reusable inflatable culvert balloon for pipeline plugging. Multiple standard sizes 600/900/1200mm available, custom diameter & length rubber airbag for culvert construction. Good wear resistance and pressure resistance, simple inflation operation, widely used in bridge and municipal drainage engineering.