... of: AEROFLEX insulation of EPDM, 2 x corrugated stainless steel tubes (feed and return), black protection film, UV ... .75² VDE Corrugated stainless steel tube:--Material :SUS304/316L-- High Flexibility--Recommended pressure at 200 °C DN ... DIN 4102.---No embrittlement of copper and stainless steel pipes according to DIN 1988 part 7;--- ... ,15m,20m,25m,30m Pre-insulation Solar water heater corrugated hose