The vacuum tube adopts the three-layer heat collection techniques: higher heat-getting efficiency, reducing the water-stagnation Parabolic surface internal bladder: higher pressure-supportive capability ......

The vacuum tube adopts GB tube (up to the national standard) Parabolic surface internal bladder: higher pressure-supportive capability ......

The vacuum tube adopts the three-layer heat collection techniques: higher heat-getting efficiency, reducing the water-stagnation. Parabolic surface internal bladder: higher pressure-supportive capability......

The vacuum tube adopts GB tube (up to the national standard). Parabolic surface internal bladder: higher pressure-supportive capability......

The vacuum tube adopts the three-layer heat collection techniques: higher heat-getting efficiency, reducing the water-stagnation. Parabolic surface internal bladder: higher pressure-supportive capability......

The vacuum tube adopts the three-layer heat collection techniques: higher heat-getting efficiency, reducing the water-stagnation. Parabolic surface internal bladder: higher pressure-supportive capability......

The vacuum tube adopts the three-layer heat collection techniques: higher heat-getting efficiency, reducing the water-stagnation.Parabolic surface internal bladder: higher pressure-supportive capabilit......

The vacuum tube adopts the three-layers heat collection techniques: higher heat-getting efficiency, reducing the water-stagnation. Parabolic surface internal bladder: higher pressure-supportive capability......