... Pre-insulated Double Solar Hose ---Easy for installation --Excellent UV ... installation---Excellent UV and Weathering resistance---Extremely suitable for solar thermal installation Pre-insulated twin-tube system, consisting ... x corrugated stainless steel tubes (feed and return), black protection film, UV-resistant, Silicone-sensor line 2 ... ”)---Lengths: 10m,15m,20m,25m,30m solar hose with epdm black hose