... , high anticorrosionlHeat Pipe Vacuum tube:Vacuum Tube, Heat Pipe, Aluminum fin and sealing ringVacuum Tube:StructureAll-glass double-tube co-axial ... °CHail resistance25 mmHeat Pipe:-2~10-3Pa-9paM3/s Aluminum fin: thickness 0.26mm, length 1620mm Sealing ring: material silicon, color ...