... 2,Guarantee:10years , 3,beaufiful design Vacuum Tube Solar Collector: 1,Aluminum alloy shell2,Heat pipe vacuum tube3,Nylon vacuum tube ... holder4,Silicon aluminum&polyurethane foam insulation5,Galvanized steel support stand6,Copper ... 6Mpa high pressure7,It can be used for solar water heater or solarair condition. vacuum tube heat pipe pressurized solar collector