3x4 downspout adapter. Available in both 2" x 3" x 4" and 3" x 4" x 4" 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 mroe versatility than standard rigid adaptors. 3" x 4" x 4"