vacuum tube solar collector:

1)Inner tank:0.4-0.6mm thickness  304-2b stainless steel

2)outer tank:stainless steel or galvanized steel. 0.4-0.5mm thickness

3)vacuum tube :58mm*1800mm     quantity:20/25/30/40/50tubes

4) Bracket: stainless steel or galvanized steel    angle: 12/17/20/25/30/38/45 degrees

solar collector