The FLEX-Drain 4-in Polypropylene DWV Pipe Connector is a low-cost solution for connecting FLEX-Drain piping (not included). This connector can fit 3-in or 4-in corrugated pipe, 4-in PVC pipe and many other 4-in pipe varieties (not included). 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.