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Heat preservation time : 72 Hours Superior heat preservation: high density polyurethane foam insulation layer, thickness is 55mm Holes: 4 holes, water inlet and outlet, electrical heat element, vent. 2.Solar Vacuum tube Model : 47mm*1500mm,58mm*1800mm double layer concentric borosilicate tempered 3.3 glass tube; 3.Bracket(Supporting frame) Angle : 45 degree Material : galvanized steel, thickness is 1.2mm
Heat preservation time : 72 Hours Superior heat preservation: high density polyurethane foam insulation layer, thickness is 55mm Holes: 4 holes, water inlet and outlet, electrical heat element, vent. 2.Solar Vacuum tube Model : 47mm*1500mm,58mm*1800mm double layer concentric borosilicate tempered 3.3 glass tube; 3.Bracket(Supporting frame) Angle : 45 degree Material : galvanized steel, thickness is 1.2mm
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