... Excellent UV and Weathering resistance---Extremely suitable for solar thermal installation Pre-insulated twin-tube system, ... consisting of: AEROFLEX insulation of EPDM, 2 x corrugated stainless steel tubes (feed and ... DN 20/11 bar. Insulation AEROFLEX-tube of EPDM,---Light, flexible, closed cell, synthetic caoutchouc;---Free ... ,20m,25m,30m Pre-insulated Solar Hose for Solar Water Heaters