1.it is provide with three high efficiency that anti-chilliness,anti-high temperature and absord sloar energy
2.Two layers all glass vacuume tube
3.No water flowing in the glass tube
4.Special silica gel for sealing up is not easy to aging, release automatically when high temperature or high pressure in heat pipes.
5.Standard: 58-1800
Printable Vacuum tube collector, Imprinted,
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