... CE,GMC, ISO9001 certification high quality and in reasonable price solar collector for double sidewe passed CE,GMC,ISO9001 certification1.Feature: The ... copper and conducted by heat tranfer medium liquid. No water in the heat pipe vacuum tube. So,the system ... endure 0.6mpa high pressure it can be used for solar water heater or solar air condition3.specification: manifold(interior) : red copper ...