Profile: Leaf Terminator is a manufacturer of gutters. Our Leaf Terminator gutter guard's patented design feature an exclusive perforation pattern and water flow ridges & valleys that stop debris from clogging the gutters and reduce the cost of annual roof and gutter maintenance. The Leaf Terminator gutter guard has passed rigorous, independent testing by PRI Construction Material Technologies, an independent testing firm for the roofing and construction industries. It performs even in the harshest weather conditions.