... days 3.DIY installation glass vacuum tube solar collectorFeatures:1.Reliable,efficient,Twin-Glass Vacuum tube2.Easy plug-in installation ... either vertically or horizontally positioned5.Especially suit large commercial or industrial applications, such as farm, restaurant, hotel, factory,etc. ... )diameterlengthtubeSHGTC47/606.00Φ 47mm1500mm60SHGTC58/507.14Φ 58mm1800mm50 glass vacuum tube solar collector