NDS 999S 9" Sand Plastic Square Catch Basin Drain Grate is ideal for draining heavy flows from lawns, landscaped areas, under downspouts, patios, and walkways. The drain grate, also known as a drain cover, blocks drain-clogging infiltrators before they can enter your drainage system. The 9x9 drain grate fits on 9 in. square catch basin drains, risers, and low-profile adapters as the frontline to your drainage system. 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.