Underground HDPE gasoline petrol station pipe,Underaround flexible Dua 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 zeropermeation of hydrocarbons piping keep fuel where it is supposed to be.