Product Name: Vacuum Tube Solar Water Heating Place of Origin: China Outer packing: export carton Standard Met: ISO9001 Features: 1) Vacuum tube: Hard borosilicate glass tube(diameter:47mm or 58 mm; length:1500 mm or 1800 mm), 30 mm hailstone resistant. 2) Outer tank material: stainless steel plate 3) Inner tank material: SUS304 food grade stainless steel plate 4) Operating pressure: no pressure (open type) 5) Welded by high efficiency rolling welding machine with imported high quality stainless steel sheet (SUS304) 6) 55mm high dense polyurethane integral foam ensures the good heat-preservation 7) Made of imported high quality stainless steel that has good corrosive resistance and application of temperature 8) Reflection sheet is assembled from many stainless steel sheets, easy to install with the advantages of ventilation and preventing snow from collecting 9) Assembles to bar with screws for easy shipping and installation 10) Support frame: stainless steel plate with thickness of 1.2mm