149055 Amerimax Home Products 54001 4 x 8, Black, Expandable Solid Flex Drain, Expands From 2 To 8, 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 Associations Test For Crush Resistance.