... installation --Excellent UV and Weathering resistance Pre-insulated Double Solar HoseFeatures:---Easy for installation---Excellent UV and Weathering resistance---Extremely ... of: AEROFLEX insulation of EPDM, 2 x corrugated stainless steel tubes (feed and return), black protection film, UV-resistant, Silicone- ... DN20(R1”)---Lengths: 10m,15m,20m,25m,30m Pre-insulation Solar water heater corrugated hose