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 | Integrated non-pressure solar water heater
 1). Diameter of Vacuum Tube: 58mm
 2). Length of Vacuum Tube: 1600mm/1800mm/2100mm
 3). Quantity of Vacuum Tube: 15/18/20/23/27/30 (or at your request)
 4). Type of the Vacuum Tube: borosilicate glass ...
 
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