NDS 1212 12" Green Plastic Square Catch Basin Drain Grate, also known as a drain cover, is ideal for draining heavy flows from lawns, landscaped areas, under downspouts, patios and walkways. Place on top of the catch basin drain, riser, or low-profile adapter, and it defends drain pipes by blocking potential intruders such as dirt, leaves, and debris. 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.