4″ Round Flat Grate A robust round, flat drain manufactured from a structurally foamed High Density Polyethylene (HDPE) with a UV inhibitor to reduce sun damage. This grate is designed with large opening slots for maximum flow while still preventing large debris from entering the drainage system. Capable of withstanding pedestrian, bicycle and wheelchair traffic. When installed grate surface is flush with the surrounding area. Precision engineered and manufactured to attach directly to Sewer and Drain Pipe and Fittings, Triple Wall Pipe and Corrugated Pipe. Easy to use, installs in minutes and blends well with the landscape. This product is available in green, black, sand, grey and purple. Typical application would be for direct attachment to Drainage Pipe where a catch basin is not appropriate or feasible. Available in 3″, 4″ and 6″ diameters.