Spare 58mm or 47mm (please select) twin wall solar tube with or without Copper Absorber including heat pipe and internal reflectors (please select)
 
NB - we cannot send spare tubes by courier. Collection only. Please contact us to arrange collection. We may have a stock closer to you than our offices, including North Wales, Devon, West London and Kent. 
 
Length 1800mm / 1500mm
Outer tube diameter 58mm / 47mm
Inner tube diameter 45mm / 36mm
 
Glass thickness 1.6mm
Material Borosilicate Glass 3.3
Absorptive coating Graded AlNAl
Vacuum degree P<5Ã?10-2 Pa
Thermal expansion 3.3?10-6 °C
Insolation Temperature >200°C
Absorptance >93%
Emissivity <8%
Heat loss <0.8W(m2°C)
Maximum pressure 0.8Mpa
Resist cold -35 °C
Resist hailstone 25mm
Resist wind 30ms
Start-up temperature 25°C