NDS 1050 10" Green Plastic Round Grate, Connects to 8" Drain Pipes and Fittings protects your drain pipe by blocking harmful leaves and particles from getting in, while draining moderate flows of water from lawns, landscaped areas, and patios. Features an open surface area of 21.6 sq. in. and flow rate of 66 GPM. The 10 in. Round Grate connects to the 8 in. sewer and drain pipe & fittings, and 8 in. single-wall corrugated pipe for a soil-tight fit. 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.