NDS 1290 12" Black Plastic Square Atrium Catch Basin Drain Grate has a domed design that rises above the surface of the ground to block leaves, mulch, and other debris near the base of the drain grate while allowing water to flow through the top. Ideal for draining heavy flows from mulched landscape beds and natural growth areas. Drain grates, also known as drain covers, are used to intercept debris to prevent clogging the drainage pipeline. The 12 in. Square Atrium Catch Basin Drain Grate fits 12 in. catch basin drains, risers, and low-profile adapters. 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.