Amerimax FLEX-Drain 4 In. Expandable Perforated Drain Pipe is designed to versatile drainage solutions with ease and efficiency. This expandable pipe is available in lengths that stretch from 3 feet up to 12 feet and from 6 feet up to 25 feet, making it suitable for a wide range of drainage applications. The pipe features built-in soil-tight fittings, eliminating the need for additional connectors when joining multiple sections. Its durable construction allows the pipe to maintain its shape even after bending, ensuring a secure and reliable installation. Simply dig your trench, lay down the FLEX-Drain pipe, and cover it to achieve effective drainage. This product meets the Corrugated Polyethylene Pipe Association's standards for crush resistance, providing dependable performance in various outdoor drainage projects. The pipe measures 4 inches in diameter with an outside diameter of 4.09 inches and an inside diameter of 3.37 inches, and it comes in a sleek black color. Model Number: 50910