Specifications Pre-insulated Double Solar Hose ---Easy for installation --Excellent UV and Weathering ... UV and Weathering resistance---Extremely suitable for solar thermal installation Pre-insulated twin-tube system, consisting of: AEROFLEX insulation of EPDM, 2 ... (R3/4”),DN20(R1”)---Lengths: 10m,15m,20m,25m,30m Pre-insulated Solar Hose for Solar Water Heaters