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Tube with supply and return fuel lines.

tubes-2.jpg Broken heat pipe by freezing.ThumbnailsTube with supply and return fuel lines.Broken heat pipe by freezing.ThumbnailsTube with supply and return fuel lines.Broken heat pipe by freezing.ThumbnailsTube with supply and return fuel lines.Broken heat pipe by freezing.ThumbnailsTube with supply and return fuel lines.

Solar vacuum tube with supply and return fuel lines.