Corrugated design for extra strength, anchoring, and anti-flotation. Large pump chamber. Molded bottom drain drill-outs and discharge ports on both sides. Lockable weir gate creates a compression seal to stop water flow for temporary maintenance/service. Removable inlet screen inhibits frogs, fish, etc. from entering the skimmer. Weir faceplate features molded ridges to help create a tight seal with pond liner. Sturdy, double-walled lid. Large biological brushes and durable aluminum-framed skimmer net.