... -tube system, consisting of: AEROFLEX insulation of EPDM, 2 x corrugated stainless steel tubes (feed and return), black protection film, UV ... -resistant, Silicone-sensor line 2 x 0,0.75² VDE Corrugated stainless steel tube:--Material :SUS304/316L-- High Flexibility--Recommended pressure ... (R1”)---Lengths: 10m,15m,20m,25m,30m Pre-insulation Solar water heater corrugated hose