... pipe Fast,Easy,Reliable flexible twin way epdm pre insulated solar hose ,Smart Design,:Twin pipe-- 2 x flexible corrugated stainless ... °C (stagnation temperature of the collectors). The characteristic value of thermal conductivity at +40 °C, λ40°C= 0,039W/mK, at ... and return pipe line. flexible twin way epdm pre insulated solar hose Pipe system coil lengthDN 12 Length 5 m×2 ...