... for installation --Excellent UV and Weathering resistance Pre-insulated Double Solar HoseFeatures:---Easy for installation--- ... for solar thermal installation Pre-insulated twin-tube system, consisting of: AEROFLEX insulation of EPDM, 2 ... DN 16/11 bar; DN 20/11 bar. Insulation AEROFLEX-tube of EPDM,---Light, flexible, closed ... 10m,15m,20m,25m,30m Pre-insulation Solar water heater corrugated hose