Split pressurized Heat pipe solar collector heating System 1.SOLAR KEYMARK,SRCC,CE ... OEM provide Split pressurized Heat pipe solar collector heating System1,Size:58/1800,47/1500 2, ... 3.3, thickness: 2.0mm, Three target type.Insulation: rock wool or import PU,hailstone resistance: 25mmbracket ... alloy with plastic spraying; thickness: 2.0mm;Heat Insulation LayerRock wool, thickness: 55mm, density 120-140kg/ ...