... UV and Weathering resistance Features:---Easy for installation---Excellent UV and Weathering resistance---Extremely suitable for solar thermal installation Pre-insulated twin-tube ... 11 bar. Insulation AEROFLEX-tube of EPDM,---Light, flexible, closed cell, synthetic caoutchouc;---Free of PVC, CFC. Material class: B2 ... (R1”)---Lengths: 10m,15m,20m,25m,30m Pre-insulated Solar Hose for Solar Water Heaters