For control of flow through a port opening and to balance flow through parallel systems, the WACO weir gate is the answer. The weir gate opens by lowering its slide plate, allowing water to cascade over the top edge. By adjusting the height of the slide plate, the water level upstream can be controlled. WACO weir gates feature handwheel or electric operators, 1/4 in. thick reinforced slide plates, and wall-mounted extruded frames.