... solar collectorsPressurized solar collector with SOLAR KEYMARKFeatures:Heat pipe vacuum tube: 58 x 1, 800mm Heat pipe: 0.8mm in diameter ... , SRCC, ISO 9001: 2000, CE Warranty: 5 years for vacuum tube Evacuated tubeLen(mm)1800mmDia(mm)Φ58mmQuantity(pieces)18*2Area(m2)2 ... Alloy,Thickness:2.0mmFrameAluminum Alloy,Thickness:2.5mm EN-12975 evacuated tube solar collector