solar heat collector with SOLAR KEYMARK,CE,ISO,SGS Solar heat collectorMaterial:Header tube: seamless copper TU1, 22×δ1.2mmFlowing passage: high quality rose copperOuter manifold: aluminum alloy, δ2.0mmBracket: aluminum alloy, δ1.6mmInsulation: polyurethane frothing, δ40-50mmVacuum tube: tri-elements coating, copper heat pipe inside, 58×1800mmCopper heat pipe: δ0.6mmLogo: OEM stickerSpecification ...