Downspout wedges come shaped like a triangle with a funnel-like opening that fits into the downspout. Their opened grid screen allows dirt and fine tree debris to pass through, while directing large leaves away from the downspout opening.
Spiral-shaped downspout strainers also sit inside the top of the downspout. It acts as a dam, collecting and slowly releasing small debris to prevent clogging.
Dome and ice cream cone-shaped aluminum downspout screens fit inside the mouth of the downspout, covering the top opening to keep leaves and large objects from entering the downspout drain. These screens usually can be adjusted to fit most downspouts.