Perforated pipe w/sock ideal for French drain in fine soil High-grade copolymer construction for enhanced durability Easily expands up to 50ft.to ensure versatile use FLEX-DFLEX-Drain helps you get the job done faster and easier,w/professional grade durability and more versatility than traditional corrugated pipe. Flexible,bendable and expandable,FLEX-Drain easily bends around any obstacle,holds its shape during installation and w/a simple snap,its integrated soil-tight fittings lock securely and stay connected during backfilling w/this product,taping joints becomes unnecessary while the pipes' spaced slits,covered by a removable polyester sock,make the product ideal for french drain in fine soil or dispersing water from flower beds,leach fields or culvert.