... , SRCC, SOLARKEYMARK, RoHS, ISO-9001 Copper heat pipe: TU1 High efficiency Best quality Vacuum tubes assimilate the advanced 12 layers of apattering deposition ... , CCC, ISO9001, SOLARKEYMARK, SRCCSpecification: Length 1500mm1800mmOuter tube diameter 47mm58mmInner tube diameter 37mm47mmGlass thickness 1.6mm2.0mmMaterial High borosilicate Glass 3.3High borosilicate Glass ...