-HDPE Double-Wall Corrugated Pipes- Duzgunler Corrugated HDPE pipes are starting to use on infrastructure systems for removing and carrying waste water and liquids. Corrugated pipes have superior resistance against waste waters, chemical materials, corrosion and bad environmental conditions. Duzgunler corrugated pipes are also resistant to heavy traffic and soil loads because of their special designs. Corrugated pipes don't affected from seismic movements because of their flexible structures. They provide great fluidity speed and can't hang on any dreg and conglomeration due to their inner surfaces' smooth structure and low adhesion coefficient. They are completely hygienic and don't include toxic materials. Other pipe types left rapidly because of their low resistance and high cost. HDPE corrugated pipes are have service life at least 50 years. Düzgünler Corrugated pipes and pieces produced from high density polyethylene as two wall according to EN 13476-1 standards. Main Usage areas are; *Sewage systems for municipal waste liquids, *Rain water carrying systems, *Drainage systems, *Water transporting systems with gravity, *Industrial waste-water & liquids installations systems, *Cable Protection for energy and communications systems. Advantages of Duzgunler *Corrugated pipes; *Economic and low cost, *Friendly for environment, *Light weight and flexible, *Easy installation and low maintenance, *High fluidity and low friction coefficient, *Durable and long life. There are two types of corrugated pipes according to durability: SN 4: Resistant to 4 kN/m2 SN 8: Resistant to 8 kN/m2 Available Nominal Diameters: 150mm 200mm 250mm 300mm 400mm Fittings: -Tee -Elbow 90 -Elbow 45 -End Cap Unpacked.