... 40ft container 3.OEM service 4.food grade SUS304-2B Vacuum tube solar water heaterPacking: Standard export carton for FCL load,Plywood ... desity of the water, cold water down, hot water up, a cosmical physics, to circulat water through the collector and the ... preservation: 55mm,60mm imported PU4. Vacuum tube: single target vacuum tube, coating: AL/N/AL, or Three-target vacuum tube,coating:ALN/ALN-SS/CU 5 ...