Used to diver water away from foundation. Prevents erosion. Installs without tools. Bendable, flexible and expands from 19 to 55. Fits 2 x 3 or 3 x 4 downspouts. Used to divert water away from foundation.Prevents erosion.Bendable, flexible and expands from 19 in to 55 in.Fits 2 in x 3 in or 3 in x 4 in downspouts.