... pressurized Vacuum tube solar collector System 1.SOLAR KEYMARK,SRCC,CE 2.Antifreezing -40 degree 3.OEM provide Split pressurized Vacuum tube solar ... collector System1,Size:58/1800,47/1500 2,CE,SRCC,Solar keymark 3, ... spraying; thickness: 2.0mmHeat Pipe Evacuated TubeVacuum TubeThree high vacuum tube, ALN/ALN-SS/CU absorber coating, Dia: 58mm, Length ...