The drain grate, also known as a drain cover, is the frontline of your drainage system. The durable 4 in. Square Grate blocks leaves and debris from entering and potentially clogging your pipeline as it drains light flows of stormwater from small lawns, landscaped areas, patios, and walkways. The 4 in. Square Drain Grate has an open surface area of 3.5 sq. in. and flow rate of 11 GPM. With its flared-out design, the square grate has increased open surface area and flow capacity compared to a round grate matching the pipe diameter. Connects to 3 in. sewer and drainpipe and fittings, 3 in. single-wall corrugated pipe, and 3 in. triple-wall pipe for a soil-tight fit. Ideal where there isn't enough depth for a catch basin. The pipe grate is ADA Compliant and heel-proof. Made of polyethylene, a type of plastic, using virgin and recycled content treated with UV inhibitors to prevent fading and cracking. As part of a complete drainage system, the grate drains water and prevents debris from entering drainpipes. The pipes carry the water to a discharge point downstream such as a pop-up emitter, or to percolate into the ground with a dry well or infiltration trench. Find the right drainage grate for your project with the free NDS Home Drainage Center tool. NDS, founded in 1972, is the preferred choice of professionals and the leader in stormwater management solutions with proven products, tools, and support to help you get the job done right. Color: Black/Matte.