Heat pipe vacuum tubeThis tube is for pressure solar system,Website:http://www.chinatide-solar.com, water will not inside tube, and heat faster than normal tube.Glass tube dimension: 58*1800mmHeat pipe dimension: 8(14-70)x0.7mmx1700FS/8(24-70)x0.7mmx1700FS/8(14-80)x0.7mmx1700FS/8Aluminum fin: 1620mm lengthFreeze resistance: <-35℃Hail resistance: 25mmCoating of vacuum tube: ALN-SS-CU