Flex-Drain 51910 Flexible/Expandable Landscaping Drain Pipe, Perforated, 4-Inch by 12-FeetPipe unfolds and expands from 15-inches to 12-feetPerforated pipe is for ground water drainage (French drains, dispersing water from flower beds) where soil is coarseExceeds all applicable ASTM StandardsCompatible with most traditional 3-inch and 4-inch corrugated pipe and 4-Inch PVC
