Specifications: 
1, Manifold (interior): red copper 
2, Manifold (exterior): aluminum alloy 
3, Glass tube dimensions: 58mm x 1.8m / 47mm x 1.5m 
4, Heat preservation: 72hrs 
5, Hail resistance: 25mm 
6, max pressure: 6 bar 
7, Coating of vacuum tube: SS-C/CU 
8, Heat Pipe: anti-freezing > -35°C