amerimax 12-in. no dig low profile catch basin downspout extension kit, black amerimax quickly remove damaging rainwater from your home with this low profile catch basin. this low-profile catch basin will give you the benefits of a buried drainage system without the cost or hassle of digging. the kit includes a 12-in. catch basin, a decorative drain grate and an 8-ft. stretch of corrugated drain pipe. use one or both pipe knockouts to improve the flow of rainwater from all standard residential downspout sizes. once installed, you can cover the pipe with mulch, rocks or other ground cover so it disappears into the landscaping. 12-in d x 4.25-in. w x 12-in. w