Flex-drain 53102 downspout adaptor, landscaping drain pipe adapter. This unit is 3 x 4 x 4. Available in both 3 x 4 x 4-inch and 2 x 3 x 4-inch sizes, it is used to connect your downspout to flex-drain, 4” standard corrugated pipe, 4” pvc, and most other 4” pipe. The flexible design allows an easier connection with more versatility than standard rigid adaptors. All flex-drain products are made in america.