Solar vacuum tubes Competitive price and good quality Certification:CE,ISO9001 Solar vacuum tubes ModelThree-target solar vacuum tubeSingle-target vacuum tubeStructureAll-glass double-tube co-axial structureGlass materialHigh borosilicate 3.3 glass Diameter x length47x1500mm,1.6mm thickness, inner tube diameter:37mm58x1800mm,1.6mm thicnkess, inner tube diameter:47mm70x2000mm,2.0mm thickness,inner ...