this kinds of pipe is new type of light-weighed pipes, with smooth inner surface, ladder-shapped corrugated outer surface. material: PE 100 or pe80 advantage: with its unique wall structure desigh, such pipe has advantage of strong ring stiffness, light wieht, high pressure risistance,good toughness, anticorrosion, anti-abrasion, convenient and low cost installation and long service life.etc. it ...