1.Anti-freezing,resist wind and hail well 2.CE,ISO,SRCC approved 3.can endure 0. ... 10~30 pcs8. Heat Pipe: 0.7 mm Copper with Anti-Freezing Fluid9. Dia. of Condensor: 14 mm/24 ... : 3~7 WorkdaysMaterial:heat pipe material: borosilicate glass,with a red copper pipe in it.heat pipe QTY: ... Wind stress:180km/hFreeze protection:-25 degree. fashionable and practical Sun Collector (with CE, RoHS, CCC SGS ISO9001