... .Specification: 2m*1m*70mm/80mm/90mm, 2m*1m flat solar collector, the water can rise to 55°C in the Sun ... or all copper core, heat pipe diameter: 22mm/25mm. Few welding line, high intension, and strong pressure resistance.4. Coating: Anode ... selective black chrome, magenetic sputtering, and anodized electrophoresis available.Ultrasonic welding technology to joint the tube and fin together perfectly.High ...