Flex-Drain 53127 Flexible Downspout Extension Adapter, 3 by 4 by 4-Inch, White Connect your downspout to white flex-drain pipe! color-coordinated to match their environments Exceeds all industry standards for strength and durability(astm) 30-percent higher load-bearing rating than standard corrugated pipe Compatible with most traditional 3-inch and 4-inch corrugated pipe and 4-inch PVC The downspout adapter side is 3-inch by 4-inch and the pipe is 4-inch, also available with 2 by 3 downspout and 4-inch pipe