LC-P002 pressurized vacuum tube Solar Energy Project 1,high heating efficiency ... easyly installation 3. energy-saves LC-P002 pressurized vacuum tube Solar Energy Project Specification:1) Vacuum tubes: Φ47 ... 500mm, Φ58 x 1,800mm, Φ70 x 2,100mm2) Vacuum tube size: 15, 16, 18, 20, 24, 26, 28, ... with advanced science and technology4) The hot water system fitting for families and work units5) The effect of ...