NDS 991 9" Green Plastic Square Atrium Catch Basin Drain Grate features a domed design that rises above the surface of the ground, and is ideal for moderate flows in mulched landscape beds, natural growth areas, and window wells to trap pipe-clogging particles at its base while allowing stormwater to drain. The 9x9 square atrium drain grate is compatible with 9 in. square catch basin drains, risers, and low-profile adapters. Built to stand up to the elements, it’s made of high-density polyethylene (HDPE) treated with UV inhibitors to prevent fading and cracking from the sun. Hassle-free limited lifetime warranty guarantees the NDS product is free from defects—or we’ll replace it.