2x3 Downspout Rain Barrel Diverter
A screw-on side-outlet diverter for standard 2x3 in (51 x 76 mm) rectangular aluminium downspout: cut a 58 x 34 mm window in the spout face, seal and screw this 74 x 84 mm flange over it with four #8 or M4 screws, and the 30 degree chute throws the flow sideways into a rain barrel lid instead of the flowerbed. The chute is a 64 x 40 mm rectangular tube with 3 mm walls, 58.5 mm tall as printed, gusseted at the flange so a full column of water can't snap it off — print in ASA or PETG for UV life.
outdoor downspout rain-barrel gutter