Abstract: A vertical upper inlet duct adapted to be connected to an upper section of a downspout or conductor leads downward through the upper wall of an open-ended horizontal box-shaped housing with a tapered bottom wall converging to a downwardly-tapered vertical outlet duct. The latter connects with a lower section of the downspout or conductor. A screen or grating is inserted in the box-shaped housing over the outlet therefrom, which may be cleaned of leaves or other water-borne trash collecting thereon by the user inserting his hand through either of the open ends of the housing. The screen itself is also similarly removable for cleaning.