4" x 12', Black, Expandable Solid Flex-Drain, Can Be Used In Most Drainage Applications, Soil Tight Fittings Are Built Into The Pipe & The Pipe Holds Its Shape After It Is Bent, Therefore No Other Connectors Are Needed, Simply Dig Your Trench, Lay Your Flex Drain Pipe & Cover It Up, Meets The Corrugated Polyethylene Pipe Association's Test For Crush Resistance.