Custom Extruded Multi-Port Aluminum Flat Tubes for Radiators and Condensers SUNHOPE supplies extruded multi-port aluminum flat tubes for radiator, condenser, and other compatible heat exchanger applications. Made from 3003 aluminum alloy, these tubes feature a flat profile with multiple internal channels for integration into heat exchanger designs. OEM customization is available based on your drawings, samples, and project requirements. Whether you need a specific tube