... , fashionable design, Keymark, CE, Main features of all glass evacuated tubes solar collector:Manifold: aluminum alloy Head pipe: copper Insulation layer ... 55mm Heat pipe dimension: Ø58 x 1,800mm Number of tubes: 20 pieces Collector area: 2.88m² Tube vacuum degree: ... 40ft container: 166 piecesFor more details about our all glass evacuated solar collectors, please check our website, or email us. ...