Underground flexible Dual and Secondary Containment Piping Systems is the most advanced and installer friendly double-wall piping system available for use on filling stations. The product range covers all piping needs that may arise on a filling station: Remote fill, pressure and suction, ventilation, vapor recovery or conduits.With zero permeation of hydrocarbons piping keep fuel where it is supposed to be. 1. Impermeable layer is made from pure EVOH without any modification for the best separation impact. This impermeable layer can be used together with all kinds of oil, ethanol mixture and additive, it's ensured to be appropriate for all of types of fuel in the world. 2. The proper five-layer structure makes the layers can be pasted in each other 3. Non-corroding, service life is long, It's able to bear various chemical mediators, no electrochemical corrosion. 4. It's burst pressure exceeds 40 standard atmospheric oressure, ten times of working pressure, so that higher safety can be kept. 5. Working temperature range from -40 to 50℃ , with excellent capability. 6. Lightweight, covenient for transport and installation. 7. Our own R&D team. 8. Meeting the standard of EN14125,ISO9001.