YOST Snap on Diverter has a special "Tri-fold" lid that snaps onto the front of the gutter in only seconds. The raised portion keeps roof water from gushing over the gutter at inside roof valley areas. Its 3" high and a total of 16" long. Its bent at a right angle with 8" on either side of the gutter miter. It requires no tools, caulking or fasteners and eliminates call backs