... 2.Antifreezing -40 degree 3.OEM provide Split pressurized Vacuum tube solar collector System1,Size:58/1800,47/1500 2 ... : 1.0 mm, Hole spacing: 75mm, max operation pressure 6 bar, phosphor copper brazingEnd CoverNylonDust RingSilicone Rubber 110Tube holderNylon ... plastic spraying; thickness: 2.0mmHeat Pipe Evacuated TubeVacuum TubeThree high vacuum tube, ALN/ALN-SS/CU absorber coating, Dia: 58mm, Length ...