... withstand high pressure 2. never overfull 3. longer service life evacuated tube solar collectorreliable performance, low maintenance, arbitrary combination, covenient replacement. One or ... copper channel3)Adjustable installation angles: 30°, 45°,60°4) Heat-Collecting tube specifications: 58mm×1800mm5) Anti-Hail: 25mm6) Bracket: Aluminum alloy7) Anti ...