National Diversified Sales 2412 24" Green Plastic Square Catch Basin Drain Grate drains stormwater into the catch basin and defends your drain system by blocking out leaves, twigs, and other debris before they can enter and potentially congest the pipeline. The 24" square outdoor drain grate works with 24" Square Catch Basin Drains and Risers to collect heavy flows from lawns, landscaped areas, parks, driveways, and courtyards. The large catch basin drain grate, also known as a drain cover, is made of high-density polyethylene (HDPE) treated with UV inhibitors. Hassle-free limited lifetime warranty guarantees the NDS product is free from defects—or we’ll replace it.