The FLEX-Drain 3 in. x 4 in. x 4 in. Polypropylene Downspout Adapter offers polypropylene construction and a flexible design that can bend to fit tight spots and curved spaces. This adapter fits 2 in. x 3 in. downspouts on 1 end and 3 in. and 4 in. corrugated pipe and 4 in. PVC piping on the other end. FLEX-Drain helps you get the job done faster and easier, with professional grade durability and more versatility than traditional corrugated pipe. Flexible and expandable, FLEX-Drain easily bends around any obstacle, hold its shape during installation and with a simple snap, its integrated soil-tight fittings lock securely and stay connected during backfilling. FLEX-Drain is a complete drainage solution system that's widely compatible with virtually all traditional 3 in. and 4 in. corrugated pipe and 4 in. PVC. Technologically superior, it's made with no-break copolymers and exceeds all applicable ASTM crush standards.