... resistant silver brazed copper header7.Aluminum frame8.Power coated (black,brown or silver) aluminum casing9.Stable solar conversion during ... of Tube1800mmOuter Diameter of Tubeφ58mmTube Quantity1518202430Manifoldcasing material,Aluminum Alloy,Thickness,1.8mm,Insulating layer,compressed rock ... woolHeat Pipe pure red copper TU1+water,transfer power>=150W,Working pressure,4Mpa,welding pressure 4MpaDust ...