- Vacuum tubes
- 2016-12-29 20:32
- Features:1) Structure: all glass coaxial dual-tubes, an inner tube inside the dual-glassouter tube2) Material: high boro
- solar collector
- 2016-12-29 20:28
- We produce at presentF47, F58, F70 pipe diameters. The lengthes are 1.2m,1.5m,1.6m,1.7m,1.8m,2.0m, and 2.1m, AI--N/AI al