... storage tank, under JOYON trademark. Heat Pipe Collector, solar collector, JY-3XSplit pressurizedProduct description: vacuum tube (evacuated tube), copper heat pipe, connect tube, aluminum fin, transfer liquid, etc ... : Rockwool 5.Rubber Seals and Rings UV stabilized high temperature silicone rubber 6.Heat exchanger material: Red Copper 7.Permissible operating pressure ...