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Vacuum Tube Solar Water Heaterspecifications:1. Material of inner Water tank: 0.31mm,/ o.4mm/ 0.5mm 304-2B(food-level stainless steel) 2. Material of outer Water tank: 0.31mm, 0.4mm, 0.5mmstainless steel,3. Heat preservation: 55mm,60mm imported PU4....
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